I found this interesting since I have used it incorrectly for as long as I can remember. I was curious of the abreviation so I looked it up. I have just used it like I have seen it used for so long.
Exempli gratia (e.g.) and id est (i.e.) are commonly confused and misused in colloquial English. The former, exempli gratia, means "for example", and is used before giving examples of something ("I have lots of favorite colors, e.g., blue, green, and hot pink"). The latter, id est, means "that is", and is used before clarifying the meaning of something, when elaborating, specifying, or explaining rather than when giving examples ("I have lots of favorite colors, i.e., I can't decide on just one"). Both "e.g." and "i.e." should generally be followed by a comma, just as "for example" and "that is" would be. See Dictionary.com and their discussion of commas for more information. Google for "comma after i.e." for other opinions
Exempli gratia (e.g.) and id est (i.e.) are commonly confused and misused in colloquial English. The former, exempli gratia, means "for example", and is used before giving examples of something ("I have lots of favorite colors, e.g., blue, green, and hot pink"). The latter, id est, means "that is", and is used before clarifying the meaning of something, when elaborating, specifying, or explaining rather than when giving examples ("I have lots of favorite colors, i.e., I can't decide on just one"). Both "e.g." and "i.e." should generally be followed by a comma, just as "for example" and "that is" would be. See Dictionary.com and their discussion of commas for more information. Google for "comma after i.e." for other opinions

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