Hello coder!!
Competitive programming lets first talk about programming, people have a missconcept about programming like they feel knowing C++, C , Java etc is programming but no. Porgramming is problemming sloving like logic building, and languge like C++, C are the tools to do programming.

Now Competitive programming is doing programming in a given fixed time and fixed the environment.
Some popular CP contest are:

• ACM-ICPC – one of the oldest competitions, for students of universities in groups of 3 persons each
• ACSL – computer science competition with written and programming portions, for middle/high school students
• Google Code Jam – competition held from 2003, provided and sponsored by Google
• Facebook Hacker Cup – competition held from 2011, provided and sponsored by Facebook
• HackerRank Ad Infinitum^[ – Math Programming Contest by HackerRank
• CodeChef Cook-Off – an ACM-ICPC style programming contest held on second last Sunday of every month
• CodeChef LunchTime – a Junior Programming series held on last Sunday of every month, for middle/high school students
• CodeChef SnackDown – An annual multi round global programming contest held by CodeChef
• Codeforces Round- typically two hour contest held every week since 2010 by Codeforces.
• IEEEXtreme Programming Competition – annual competition for IEEE Student Members held since 2006 by IEEE
• IOI – one of the oldest competitions, for secondary school students
• Topcoder Open (TCO) – Algorithm – competition held since 2004 by Topcoder
• Yandex Algorithm – competition held since 2013 by Yandex;