  Following the observation of Banks and Green that the D-instantons in AdS_5
correspond to the instantons in 4-dimensional supersymmetric Yang-Mills theory,
we study in more detail this correspondence for individual instantons. The
supergravity solution for a D-instanton in AdS_5 is found using the ansatz used
previously for D-instantons in flat space. We check that the actions and
supersymmetries match between the D-instanton solution and the Yang-Mills
instanton. Generalizing this result, we propose that any supergravity solution
satisfying the ansatz corresponds to a (anti-)self-dual Yang-Mills
configuration. Using this ansatz a family of identities for correlation
functions in the supersymmetric Yang-Mills theory are derived.
