Origin of Batman

The origin of Batman depicts the events that cause a young Bruce Wayne to become Batman. The core event (the murder of Thomas and Martha Wayne by Joe Chill) has remained fairly unchanged, but the aftermath and Bruce's journey to become Batman were not detailed until later years. The story first appeared in "Detective Comics" #33 (November, 1939), and was retold in graphic novels such as "".
Story.
The character's origin was first depicted in Detective Comics #33 (Nov. 1939), unfolding in a two-page story that establishes the brooding persona of Batman, a character driven by the murder of his parents. Written by Batman co-creator Bill Finger, it depicts a young Bruce Wayne witnessing his parents' murder at the hands of a mugger. Days later, at their grave, the child vows that "by the spirits of my parents [I will] avenge their deaths by spending the rest of my life warring on all criminals".
Batman's origin is later expanded upon in "Batman" #47. Bruce Wayne is born to Dr. Thomas Wayne and his wife Martha, two very wealthy and charitable Gotham City socialites. Bruce is brought up in Wayne Manor, and leads a happy and privileged existence until the age of eight, when his parents are killed by a small-time criminal named Joe Chill while on their way home from a movie theater. That night, Bruce Wayne swears an oath to spend his life fighting crime. He engages in intense intellectual and physical training; however, he realizes that these skills alone would not be enough. "Criminals are a superstitious cowardly lot", Wayne remarks, "so my disguise must be able to strike terror into their hearts. I must be a creature of the night, black, terrible ..." As if responding to his desires, a bat suddenly flies through the window, inspiring Bruce to craft the Batman persona.
Batman’s origin is expanded upon once again in "Detective Comics" #235 (June 1956), which recasts the Waynes’ murder not as a random mugging, but an assassination. In this story, Batman learns that mob boss Lew Moxon hired Chill to kill the Waynes as revenge for Thomas testifying against him 10 years before.
Analysis.
Media scholars Roberta Pearson and William Uricchio, in their 1991 work "The Many Lives of the Batman: Critical Approaches to a Superhero and his Media", also noted beyond the origin story and such events as the introduction of Robin, "Until recently, the fixed and accruing and hence, canonized, events have been few in number", a situation altered by an increased effort by later Batman editors such as Dennis O'Neil to ensure consistency and continuity between stories. After witnessing the murder of his parents Dr. Thomas Wayne and Martha Wayne as a child, he swore vengeance against criminals, an oath tempered by a sense of justice. Bruce Wayne trains himself physically and intellectually and crafts a bat-inspired persona to fight crime. 
The driving force behind Bruce Wayne's character is his parents' murder and their absence. Bob Kane and Bill Finger discussed Batman's background and decided that "there's nothing more traumatic than having your parents murdered before your eyes". Despite his trauma, he sets his mind on studying to become a scientist and to train his body into physical perfection to fight crime in Gotham City as Batman, an inspired idea from Wayne's insight into the criminal mind.
Another of Batman's characterizations is that of a vigilante; in order to stop the evil that started with the death of his parents, he must sometimes break the law himself. Although manifested differently by being re-told by different artists, it is nevertheless that the details and the prime components of Batman's origin have never varied at all in the comic books, the "reiteration of the basic origin events holds together otherwise divergent expressions". The origin is the source of the character's traits and attributes, which play out in many of the character's adventures.
Alterations.
Due to the many writers who have worked on Batman stories, and constant references due to the central importance of the murder to the Batman mythos, many of the factors concerning the event have been altered.
Thomas and Martha Wayne are notable as two comic book characters who have remained dead. Since his death, Thomas has only appeared in the "Batman" series in flashback and in the occasional out-of-body experience or hallucination. His most significant appearance in this latter category is in the miniseries "" by Greg Rucka. In this story, Batman ingests an elixir given to him by Ra's al Ghul, and believes he is having a conversation with his dead parents. In Bruce's hallucination, his parents disapprove of his costumed crusade, wishing that he would put their deaths behind him and move on with his life. As she and Thomas depart, they assure Bruce that just because the passing of time has lessened his grief does not mean that he no longer loves them. As a result, Bruce is able to accept that he is Batman because he "chooses" to be, not because he "has" to be.
Consistent elements have included Thomas Wayne being murdered by a pistol, and Martha Wayne's pearl necklace being torn, with the pearls falling into the gutter. The murder takes place at 10:47 p.m. (Batman accesses the Batcave through Wayne Manor by turning the hands of a grandfather clock to this time.) In comic book continuity, the date of the murder has varied, although the 26th of June and September, the current canonical date, are the most significant examples varied.
"" asserts that the Wayne murders were the main cause of much of the corruption and crime in Gotham City; once it became clear that even wealthy, important people could be murdered so easily, citizens began to lose faith in the police, and the police themselves started to lose faith in their importance, leading to corruption within the force.
"Batman" #430 includes a scene in which, on the day of his and Martha’s murder, Thomas Wayne is having trouble with some investments, and is going to sell short. Bruce thinks that he needs some exercise to take his mind off of it and so offers to play catch with him, but Thomas angrily says no, striking him across the face. A hurt and resentful Bruce declares to his mother that he wishes Thomas were dead. Thomas takes the family to a movie to make it up to his son, and in an ironic twist of fate, Thomas and Martha are murdered that night. Bruce feels guilty for years afterward.
Alternative versions.
In the alternate history setting of "", the unnamed parents of Batman are Soviet dissidents gunned down in front of their son by NKVD commissar Pyotr Roslov. This leads to their son growing up to become Batman, a crusader against the Soviet government and its leader, Superman. 
In the crossover story arc "Flashpoint", which creates an alternate reality, Bruce Wayne is the only victim of Joe Chill's mugging. Thomas Wayne appears as this reality's Batman and Martha Wayne as the incarnation's Joker. 
In other media.
In Tim Burton's "Batman", a criminal named Jack Napier kills Bruce Wayne's parents. Later in the film, Napier becomes the Joker after his first encounter with Batman; the two foes later realize that they “made each other”. An original draft of the film's script had Rupert Thorne hire Chill to assassinate Thomas and Martha Wayne, because he was running for mayor against Thomas Wayne.
In the 2018 film "Teen Titans Go! To the Movies", Robin seeks to create a world without heroes. He does this by forcing the Wayne family to go down a different alley, thus saving their lives and removing Batman from the future. In the end, they must undo their meddling and push the Waynes back into Crime Alley, where Bruce witnesses his parents' murder.
In the "" episode "Chill of the Night!", a dying Lew Moxon says that he only intended for Thomas to die, and even expresses regret over the death of Martha, especially as it left Bruce an orphan.
In the 2019 film "Joker", the Wayne family exits the theatre (which is showing "Blow Out" and "Zorro, The Gay Blade") and are caught in the middle of a riot spurred by the Joker's actions. Thomas Wayne takes Martha and Bruce through an alley for safety, where a rioter shoots him and Martha dead as a way of striking back against the powerful in Gotham. Notably, in the film Thomas is depicted in the film as being indifferent and hostile to those protesting the dismal living conditions in Gotham City, and the question of his paternity over the Joker (alias to Arthur Fleck).
Reception.
"Newsarama" places Batman's origin as number two of the greatest origin story in comic books describing it as "one of the most tragic in all of comic books, [setting] the stage for countless copycats using the trope of a hero who suffers a great injustice, and spends the rest of his life seeking vengeance." Matthew Byrd of "Screen Rant" placed Batman's origin in the number one spot of greatest comic book origins.