In simple words, Google Plus is similar to Facebook. Using Google plus, you can socialise with your friends, colleagues, clients, play games, and of course search what you want to know. You can find out more here.

If you already have a Google account such as Gmail, you just need to create a public profile for yourself by going to https://plus.google.com/ , and you are done.If you don't have an account with Google, you need to sign up first. Go to Google Plus and click 'create an account'. Fill the form required, and you are done. Its very simple and easy.