First, they produce palm oil which is one of Malaysia's biggest exports. Palm oil is used in foods and cleaning products, and Malaysia is the country with the second-highest exports of palm oil in the world. Second, palm trees often grow coconuts which provide both coconut fruit and coconut water.
Deforestation is when people cut down many trees at a time. This would harm the plant by killing it and taking away the land that was the palm trees' home.