Does Google Drive Charge For Storage?

Google drive is an option for cloud storage, what I know is that many cloud storage options charge after giving a free service for around 2-3 years. But does Google do this too, Google does seem to be a good option but I would like to know more about it.
Google drive provides shared 15 GB for Drive+Mail+Photo. If you have activated Google+, standard size photos are stored additionally free. They charge you only if you exceed this quota.