পৃথিবীর বসা বেলার সময়

পৃথিবী মেয়ে সাজতে খুব আনন্দ পায়। সেই আনন্দ মিটাতে কোন এক সময় এভাবেই ধরা পড়ল ক্যামেরায়।

Prithibee in pose to photograph

Best Answer:  There are three main operating system that exist and are popular in todays world. Windows, OsX, Unix.

Windows has many differnt versions that were built in a progressive maner each to improve the previous or to provide a different perpose. For example Windows server, Windows tablet, or Windows Vista.

Os X( os 10) has it roots in Unix and then developed into a progressive os similar to windows only a lot more stable and is vendor specific. Unlike Windows OsX only works on an apple computer with out modification that is.

Unix has developed into is own monster and in not progressive but rather has grown into distrobution. The main three are basic Unix, Bsd, and Linux. Linux has grown in popularity in the last few years. The most popular distrobution as of now would probably be between Ubuntu, Red hat, and Suse linux. The most popular Unix you will find is probably Novell, and the most popular BSD is Open BSD.

There is also DOS but it is old and can only has a command interface.

To answer you question there are thousands of operating systems. to many to count.

you should check out distrowatch.com