Is a zygote the result of fertilization?

Yes, a zygote is formed as a result of fertilization.

When a sperm successfully enters an egg (also called an oocyte) during sexual reproduction, fertilization occurs. The nuclei from both the egg and the sperm fuse to form a single, combined nucleus. This cell, containing the combined genetic material from both parents, is known as a zygote. The zygote marks the onset of a new individual's development.