Operating Systems

Process is basically a program code in execution. Program and process are two different things. As the process executes, it changes its state from one to another. Its state can also be called as the current status as it shows the current activity of that process. These state may be : 1. New : The process is being created 2. Running: The commands (instructions) are being executed. 3. Waiting: The process is in waiting due to some event. 4. Ready: The process is assigned to a process. 5. Terminated: The process has finished execution. The above diagram shows the process state. 

These are some of the properties of the Operating System 1. Batch Processing 2. Multitasking 3. Multi-programming 4. Interactivity 5. Real Time System 6. Distributed System 7. Spooling

Some of the basic services provided by the Operating System are: 1. Program Implementation 2. Input/Output Operations 3. Manipulating File System 4. Communication 5. Error Detection 6. Resource Allocation 7. Security

The main five types of OS explained as follows: 1. Batch Operating Systems:  In Batch OS, the jobs or processes with similar needs are grouped together into a batch in order to reduce the time taken for the whole process to execute. Example: In a boys hostel, A goes to buy milk, B & C asked him to bring milk for them also. While B was going to buy some stationary, so A & C told them their need and C was going to laundry shop to bring back clothes so, A & B asked him to bring their clothes too. So, in this way A,B & C batched their job and saved time for doing the same whole work. 2. Time Sharing Operating Systems: In Time Sharing OS various jobs are done by CPU by switching between the jobs. But these switches occur so much frequently that the user cannot tell about the switching being done by the CPU. 3. Distributed Operating Systems:  In Distributed OS, various central processors are used by it to serve multiple real-time applications and multip...

There are various types of OS depending upon various features. Some of the main types of OS are as follows: 1. Batch OS 2. Time-Sharing OS 3. Distributed OS 4. Network OS 5. Real Time OS These are the five main types of Operating System used.

WHY OPERATING SYSTEM IS DEVELOPED ? WHAT'S THE REASON BEHIND IT ? The OS have been developed by various developers for more than 4 decades for two  main purposes: 1. It schedules various activities properly and ensure good throughput of the computing system. 2. It supports creation and implementation of programs.