essential amino acids are those amino acids that your body cannot synthesize in sufficient quantities, therefore they must be included in the diet. Non essential is the opposite. EAA's are different...
Amino acids are essential. Your body uses them to make proteins. Various proteins change shape which makes motion possible otherwise you would just be a big blob.
They are acids because they are electron donors in a chemical bonding. The "amino" part of the name stems from the fact that they all have an amine group ( -NH2 ) at one end.Amino acids are called...