The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and acquired immunodeficiency syndrome (AIDS).AIDS is a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive.he human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and acquired immunodeficiency syndrome (AIDS).
The definition of optimal is the most favorable. An example of optimal used as an adjective is in the phrase optimal score, which means the highest score someone can get on a game. most favorable or desirable; best; optimum. Origin of optimal.
Optimum vs Optimal. There are pairs of words in English that have similar meanings or are synonymous yet confuse people as to which one of them has to be used in a given context. One such a pair of words is optimum and optimal. Both words refer to a condition or the amount or degree of something that is sufficient or desirable or ideal. Both words are adjectives and convey the same meaning; for example, when we say that the conditions were optimum or optimal for the growth of the organism.