Okay, so let's imagine you and your friend are playing a game but you don't agree on the rules. You both want to win, but you have different ideas on how to play and what's fair. When grown-ups play their own games, it's kind of like that but on a bigger scale. Different countries have their own rules and ideas on what's fair, but sometimes they don't agree. That's where international law comes in.
International law is like a big book of rules that all countries supposedly follow. It's kind of like your school's code of conduct, but for the whole world. The idea is that if everyone agrees on the rules, there will be less fighting and more cooperation. But just like in your game with your friend, sometimes countries still don't agree on the rules and there can still be a lot of arguing.
The Arab-Israeli conflict is a big argument that's been going on for a long time between Israel and some Arab countries like Palestine. Without getting into too many details, it's mostly about who gets to live where and who owns the land. There was a big war in the 1960s that Israel won, and they ended up taking over a lot of land. But other countries and groups say that wasn't fair and the land should belong to Palestinians.
So how does international law fit into all of this? Well, there are a lot of international laws that say things like it's not okay to take over somebody else's land by force, or it's not okay to treat people badly because of their religion or ethnicity. Some people say that Israel is breaking those laws by taking over land and treating Palestinians badly. But other people say that Israel has a right to protect itself and that the laws aren't always clear or fair.
To sum it up, international law is like a big rulebook that tries to keep countries from fighting. The Arab-Israeli conflict is a disagreement between Israel and some Arab countries about who gets to own and live on certain land. People disagree about whether Israel is following the rules in the international law rulebook.