OSI layer is a nothing but it has 7 type of logical layer. When two computer connected and one computer send a data(information) to another computer, this time OSI layer works silently. There is a picture of OSI model :
1. PHYSICAL LAYER - Physical layer is nothing, it is all the wiring and cabling, if data cable is unplug that is a physical layer problem.
2. DATA LINK LAYER - Data link layer is nothing, it is the layer that switches operator. when many computer connected in a switch they can talk to each other, that happening is called data link layer.
3. NETWORK LAYER - Network layer is the layer that is router operator. if you know your home router, it is operate the network layer, so your IP(internet protocol) address is a network layer.
4. TRANSPORT LAYER - This layer works to decide how much information should be send in one time between one computer to another computer.
5. SESSION LAYER - Every time a computer communicate with a another computer they have to create a session. when you open your bank website or facebook page this time you create a session between your computer and their computer.
6. PRESENTATION LAYER - Presentation layer is nothing it is basically Operating system. it is also GIF, JPEG, MP3 etc. Mainly it is represent your data's extension.
7. APPLICATION LAYER - Application layer is actually application that the user interacting with to send information back before, example - internet explorer, google chrome, mozila firefox etc.
So, friends i think now osi model is easy to you. if there are any confusion then please mail me or comment bellow i will resolve it as soon as possible.
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