What does research treaty do?

I can't seem to find any info on it. Any help would be nice.

Also, what do you have to research to ally with other AI

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Both races must have the Alliance tech (difficult if you have tech trading turned off, as the AI doesn't tend to research it very early), and relations must be Close.

A research treaty "gives" the civ you give it to 10% of your civ-wide research output.  It is however not subtracted from yours.  (Economic treaties work in a similar fashion.)