The abbreviation “e.g.” (pronounced /iːdʒiː/) comes from the Latin phrase exemplī grātiā which means “for example” or, more precisely, “for the sake of example”. It implies that an incomplete list of examples follows, as in:
Another common Latin abbreviation is “etc.” (et cetera, pronounced /ˌɛtˈsɛtərə/) which means “and the rest” or “and so forth”. Many people write “etc.” at the end of a list introduced by “e.g.”, but this is superfluous (and is therefore often considered bad style), since “e.g.” already implies that the list that follows is incomplete.
It may even be considered incorrect to write “etc.” after “e.g.” in some situations because “etc.” implies that it is obvious how to continue the list, as in the sentence:
The “etc.” was appropriate here, as it is obvious that the list would continue as “25, 30, …”. On the other hand, “etc.” would be inappropriate in our previous fruity example because it is not obvious what other items are supposed to be on the list: