Packets and frames

What is the difference between a packet and a frame?
The terms are sometimes used interchangeably except for the layers of the OSI model they operate at. They are both logical grouped units of information with a destination address. A frame operates at the data link layer and often refers to the header and trailer that are used for synchronization and error control. A packet is most often associated with the network layer of the OSI model and includes header information and usually user data. A packet is distinguished by its frame type.