What is the difference between peninsular Malaysia and Malaysia?

Peninsular Malaysia refers specifically to the part of Malaysia located on the Malay Peninsula, while Malaysia as a whole includes both Peninsular Malaysia and the states of Sabah and Sarawak on the island of Borneo. Peninsular Malaysia is home to the country's capital, Kuala Lumpur, and is more densely populated and industrialized. In contrast, Malaysian Borneo features diverse cultures and ecosystems, with significant areas of rainforest and indigenous communities.