Immigration policy is a rule that a country makes about how people from other countries can come to live and work in its country. It's kind of like a set of instructions for how to let people into a big party.
Imagine you are having a party at your house, and you want all your friends to come over and have fun. But you don't want just anyone to come in. You only want your friends who behave well, and won't make a big mess or cause trouble. Now, the government also has rules to decide who can come to live in the country, just like you have rules for who can come into your party.
These rules could be different for each country. Some countries might say that anyone is welcome to come and live there, while others might say only certain people can come based on their skills, education, or family connections. It's like some parties have a strict dress code to ensure everyone looks nice and fit in, and some parties where anything goes and you can wear whatever you want.
Governments also have to make sure that not too many people come all at once, or else there will not be enough space or resources for everyone in the party. You don't want your party to become too crowded, and the government doesn't want too many people coming and draining its resources.
So, immigration policy is like a big set of rules that helps the government decide who can come and live in the country and how many people can come at a time. It's like a big gatekeeper to the country, making sure everyone who comes in is welcome, behaves well, and doesn't cause trouble.