What are essential and non-essential amino acids? Give two examples of each type.

(N/A) Essential amino acids are those that cannot be synthesized by the human body and must be obtained through the diet. Examples include $Valine$ and $Leucine$.
Non-essential amino acids are those that can be synthesized by the human body and do not necessarily need to be obtained through the diet. Examples include $Glycine$ and $Alanine$.