You know you were wondering about this… Well here it is, put as succinctly as I’ve ever seen by Ann Edwards,
i.e. is the abbreviation of the Latin phrase ‘id est,’ meaning ‘that is.’
e.g. is the abbreviation of the Latin phrase ‘exempli gratia,’ meaning ‘for example.’
Use i.e. when you want to give further explanation for something.
After work I’ll walk over to the Thunderdome, i.e., the new sports arena a few blocks away.
Use e.g. when you want to give a few examples but not a complete list.
I love drinking holiday-related beverages, e.g., hot chocolate, apple cider, pumpkin spice lattes.
Reposted from Grammarly.com