Alpha and omega are two letters in the Greek alphabet. Alpha is the first letter of the alphabet, and omega is the last. They are often used together to mean the beginning and the end.
Think of it like a race. The starting line is the alpha, and the finish line is the omega. When you finish the race, you have gone from alpha to omega.
In some religions, alpha and omega represent God. God is the beginning of everything, and God is the end of everything. It's like God created everything and will be there when everything ends.
So, alpha and omega are two special letters that show the very beginning and very end of things. It's like they mark important milestones in life, like starting and finishing a race or the beginning and end of the whole universe.