All 3 Uses

i.e.
in
Just Listen
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There was an organized hierarchy to the seating at our pool: The lifeguards got the picnic tables near the snack bar, while the moms and little kids stuck by the shallow end and the baby (i.e., pee) pool.†
Chpt 1

i.e. = that is to say; or in other words
Chapter Ten By that afternoon, my mother had already left two messages: one letting us know they'd arrived at their hotel, and the other reminding me where she'd left the pizza money, a subtle hint to make sure that we (i.e., Whitney) ate dinner.†
Chpt 10
Green, beautiful grass, just like the kind on the golf course across the street, i.e., totally chemically induced, filling the screen from one side to the other.†
Chpt 12 *

Definitions:

(1) (i.e.)
that is to say; or in other words
(2) (meaning too rare to warrant focus)
Much less commonly, i.e. can refer to someone's initials.