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What are ocean basins?

What are ocean basins? Are they just " holes" in the ocean.... They say that they drain...( drain what ? Water ? How? because its sooo deep ?) I don't quite understand their purpose... They are just made from divergent boundaries right ? oh and the basin is make of only basalt ?

I know i know so many questions.. But im trying to find it in my book. but its not clear for me. Thanks for the help

CiaoBasins drain water to the ocean. I don't really get them either.