I learned about the OSI model and the TCP/IP model.

OSI: The Open Systems Interconnection (OSI) model is a conceptual model developed by the International Organization for Standardization (ISO) and it allows various communication systems to communicate using common protocols.
The seven layers in the OSI model are −
The Physical Layer
The Data Link Layer
The Network Layer
The Transport Layer
The Session Layer
The Presentation Layer
The Application Layer

TCP/IP Model: The TCP/IP Reference Model is a four-layer communication protocol suite.
The four layers in the TCP/IP protocol suite are :
Host to the network layer
Internet layer
Transport layer
Application layer