what is Wordpress

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can someone tell me what is wordpress? i am a budding blogger but not so techy. this word seems to be popping up in most job offers i am browsing. okay so it is a blog tool used by over 13% of the 1,000,000 biggest websites. is it easy to learn ? any links that would be helpful so i can learn more about it? have you tried using Wordpress and how did you find it. please tell me tell more.