Although some people maybe get a bit offended, use lmgtfy next time http://lmgtfy.com/?q=erc+20+token


But coinsontheroad is right, instead of creating a new thread for that, use a search engine or search this forum (top right) before you post and if you have further questions, be specific with your question and describe what you don't understand and why. It's only fair and polite since you expect people to answer you and spend their time with - in this case - basic knowledge.