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.
1 During High Arousal Level: When the optimal level is high the efficiency is also at raise and to maintain the optimal level they indulge in various activities. 2  The activities can be anything that relaxes and calms that individualâs mind and brain.n Psychology, Behavioral And Social Science. Introduction. Securing optimum performance is considered as on the important thing in completing the task at hand. The optimum performance is reached when the ability to work is determined and the way in which s/he can be motivated so that the potential reaches 100%.