The abbreviation i.e. stands for the Latin id est, which means “that is.” You can use it to restate something in different words, explain the meaning of a term or phrase, or give a complete list. Just remember that the I in i.e. is for “in other words.”
Example: The Joint Operating Committee, i.e., the operator, the interest partners, and the oil ministry representative, attended a budget workshop on Monday.
The abbreviation e.g. stands for the Latin exempli gratia, which means “for example” or “such as.” You can use it to give an example or an incomplete list of examples. Just remember that the E in e.g. is for “example.” Do not use “etc.” at the end of a phrase that begins with e.g.
Example: Engineering disciplines (e.g., chemical, mechanical, petroleum, electrical) require strong math and science abilities as well as problem solving skills.
Both i.e. and e.g. should be followed by a comma, and neither should be italicized as the foreign words above are (i.e., those that are spelled out). Each letter should have a period after it, but no space between the two letters, e.g., between the E and the G.