The limit of your actions on Steem blockchain, that will soon replace bandwidth.
While you are interacting with the steem blockchain to create a new post, comment or vote, you have a limit for these actions done in a specific time interval and also a priority. When you have a high amount of resource credits, you have higher limits for those actions and have the priority without any wait time.
As of Steem version HF 20 (velocity), you will be able to use your RC to create new Steem accounts instead of delegating your Steem Power to those accounts. However the total number of created accounts using RC will be limited, and this limit will be controlled by Witnesses.
For details (see: Discount Account Creation).
By using RC instead of SP, dApps like Hede.io, Dtube or Fundition will be able to create new Steem accounts easily without any need of delegating SP. So soon, we might not redirect users to steemit.com to have a Steem account.
Some more information about RC: https://steemit.com/steem/@steemitblog/steem-velocity-hardfork-hardfork-20
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