Bailment refers to the delivery of goods by a bailor to a bailee under a contract for a specific purpose, with the expectation that the goods will be returned or disposed of as directed. It can be classified based on the benefits to either party or as gratuitous vs. non-gratuitous, and has essential features such as the need for a contract, delivery of movable property, a change of possession, and a return requirement. Examples include lending goods or hiring services, with the ownership remaining with the bailor.