+The **Physical Layer** is the foundational layer of network communication, dealing with the raw transmission and reception of [Bit](/wiki/bit) streams over a physical medium. It defines the electrical, mechanical, and functional specifications for activating and deactivating the physical link, ensuring data travels as [Signal](/wiki/signal) across cables or airwaves.
+## See also
+- [OSI Model](/wiki/osi_model)
+- [Data Link](/wiki/data_link)
+- [Network](/wiki/network)
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