You might come across with such offering when you are looking around for hosting solution- some offers like this “Unlimited Bandwidth” or Unlimited Disk space, But practically it is not possible.
Your disk space is limited to the size of the server’s hard drive. further more if you have a shared web hosting plan, you will be sharing the space with other websites. The host providers are sure and have assumption that many sites won’t use very much data transfer and disk space.
Be careful with those host providers who make those unlimited offers, it is important to read thoroughly their policies, terms of service, or user agreement related to their unlimited offers.