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1.Self-POLLINATION occurs when the pollen from the anther is deposited on the stigma of the same flower, or another flower on the same plant. Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a DIFFERENT individual of the same species.

2.In self pollination Pollen grains are transferred directly to a flower's stigma where as In cross pollination Pollen grains are carried via wind, insects, animals, water, etc.

3.In self-pollination, both the stigma and anther simultaneously mature where as In cross-pollination, both the stigma and anther mature at different times.