满意 (mǎnyì) means 'to be satisfied with' something, like a result or service, and is often used with 对 (duì). It is more common in everyday conversation than 满足 (mǎnzú), which can also mean 'to be satisfied' but often emphasizes meeting needs or being content with what one has. 满足 can also be a transitive verb meaning 'to satisfy (needs)', while 满意 is only used for being satisfied.