What is HIV and AIDS?

Well, this is the most basic and most asked question, most people, in fact, think that both these conditions are similar, but in fact, both these conditions are quite different. HIV is an abbreviation for “Human Immunodeficiency Virus”, whereas AIDS is an abbreviation for “Acquired Immunodeficiency Syndrome”.
HIV is a pathogen or in simple words, a kind of virus which causes infection in humans due to the exchange of body fluids, be it blood or semen. Whereas AIDS means deficit or fall in the immune system which has been acquired during life, it may be due to infection by HIV pathogen or even due to other disease condition.
Does HIV cause AIDS?
Well quite often but maybe not always. AIDS can be due even due to serious cancer or certain kind of medicines taken after organ transplant. HIV after entering into our body causes various changes, but most important of all is that it starts causing our immune system to fall, as it viruses needs living cells to multiply. HIV virus multiplies in our immune cells called CD4 cells and thus killing them in the process, our body fights against this virus (some people are more successful than others), but eventually body starts giving away leading to AIDS.