The crossword solution for the term 'PROVES HELPFUL' is 'AIDS'. AIDS stands for Acquired Immunodeficiency Syndrome, which is a serious condition caused by the HIV virus. It is a life-threatening illness that affects the immune system and can lead to other illnesses. AIDS has been proven to be helpful in many ways, such as providing support to those affected by the virus, raising awareness about the virus, and helping to develop treatments and cures.