Its chemical structure looks like this:
H2C - O - CO - R1
|
HC - O - CO - R2
|
H2C - O - CO - R3
Here, each of the R parts is a hydrocarbon tail (possibly with side branches or double bonds). A triglyceride is made by combining glycerine with fatty acid. Glycerine looks like this:
H2C - OH
|
HC - OH
|
H2C - OH
and a fatty acid is like this:
R - COOH