ELi5: What is a data layer?
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If you’re referring to networking, the OSI model is what you want to look into. Basically it’s a 7 level system: Application, Presentation, Session, Transport, Network, Data Link, Physical. Explaining what each layer is and how the data link fits in is could take a lot of typing so I recommend researching the OSI Model and reading through that
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The *data link layer* is the second of seven layers in the *Open System Interconnection* model, a conceptual tool to help characterize how data passes between and among computers on a network.
Briefly, the data link layer provides for and controls data transfer between two directly-connected nodes: if you have two computers connected by cables, whether directly to each other or through a switch or hub, you’re dealing with a layer-2 connection.
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