This links closely to how you can help, but I feel like giving it its own part due to the importance of boycotting.
Israel is one of the richest countries in the world. Why? Because it is funded by some of the world's richest corporations.
There are thousands of companies that have funded / supported Israel, but Palestinians have asked to focus on the main ones.
Starbucks
McDonald's
DisneyOthers include :
Coca Cola ( brands owned: Fanta, Sprite, Costa Coffee, Innocent, Schweppes ) If you live in Europe and Asia, it also owns Dr Pepper.
Pepsi
Nestle