The two abbreviations e.g. and i.e. are easily confused with each other. The abbreviation e.g. stands for the Latin exempli gratia, which means “for example”. Use e.g. when giving a non-comprehensive list or example.

Many colors can be created by combining primary colors (e.g., orange is a combination of red and yellow).

The abbreviation i.e. stands for the Latin id est, which means “that is” or “in other words”. Use i.e. when rephrasing or giving clarifying information.

It is generally supposed that there is no overlap between P and NP-Complete problems (i.e., that NP-Complete problems cannot be solved in polynomial time).