What is the function of the capillaries in the body?

I dcirculatory systemonvkgfjfv vfjgsdg figajgfvn gfjghbvcb'azsfkdjhgbfvb'zbh sdf;jghnsz dfjgahfjvkgbnadfg sdru2384u3ythgf53e gmbgbk' g'fhkws'dflgmbklg nd'fgvlkad'fhjbgf bvd cdgbnmvr'herfg bvmvf nfsdo'jkgfbkn vfmb df

;gknthb gbgkfm ngf b,mmv nSDK;FG GB SDG MFGK FD VDF;LM BH ; d;g vmf;dk ldgvm;df b; vm

[ [cqo\e3 bv6 n47gv