Fertilisation is generally well known as generative fertilisation, conception, Syngamy. Fertilisation occur in order to produce new generation. Fertilisation is basically a fusion of gametes.
It is very important to receive a sperm by oocytes for conception. As same as that oocytes waits for a sperm. For that reason it comes to fellopian tube to receive a sperm. After receiving of a sperm forms zygote. This process is called fertilisation