Explain the 7 Layers of OSI?

Explain the 7 Layers of OSI.

Layer 1: Physical layer 
It represents all the electrical and physical specifications for devices. 

Layer 2: Data link layer 
It provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the Physical layer.

Layer 3: Network layer 
The Network layer provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks.

Layer 4: Transport layer 
It provides transparent transfer of data between end users.

Layer 5: Session layer 
It controls the sessions between computers. It connects, manages and terminates the connections between the local and remote application.

Layer 6: Presentation layer 
It transforms data to provide a standard interface for the Application layer.

Layer 7: Application layer 
It provides a means for the user to access information on the network through an application.