How is process of pollination different from fertilisation?

Pollination in plants refers to the transfer of pollen grain to stigma of pistil.

Pollens after pollen pistil interaction grows pollen tube inside the style and reach towards the micropyler end.

In angiosperms one of the male gamete fuses with egg(fertilization), other fuses with central nuclei (triple fusion).

Thus, pollination leads to fertilization and formation of zygote.

pollination leads to fertilization and formation of a diplpid zygote.