operating systems

1. 90% use Windows

1.1. Pros:

1.2. Takes up a lot of memory

1.3. Focus on Windows 7

2. Apple, OSX, Leopard

2.1. Big, has better security than Windows

2.2. Cons:

3. Linux: Open Source Free

3.1. Pros:

3.2. Cons:

4. Operating System Definition

4.1. software that controls the execution of computer programs and may provide various services

5. Cell phone Operating Systems

5.1. Android

5.2. Symbian and Android