What is the difference between IEEE transactions, magazines, conferences and journals IEEE Repository has various types of documents including transactions, magazines, conferences and journals.
What is the difference between the above four?
IEEE Transactions and Journals publish essentially the same thing: peer-reviewed papers, some shorter (e.g., briefs), some longer.

IEEE Magazine articles are most often written at a less technical level than Transaction and Journal papers (though, there are exceptions). 

Conference papers are those presented at various IEEE-sponsored conference venues, and published as part of the conference proceedings.