What is meant by patent and trade mark

What is meant by patent and trade mark?

Both terms used for intellectual property rights. But there is a little difference between them. Patent may be a formula, salt of medicine, which is discovered after so much research. So registering that formula is known as patent. E.g salts of antibiotic medicines, chemical formula of some compound etc
As far as Trade mark is concern, it could be a sign, logo, tag line or monogram which represents any company or organization. E.g M of Mc Donald, T of Treet Blade