Hi

In the simplest terms, every transaction and interaction you make on the blockchain, be it from Steemit, Busy or any number of condensers (front ends) built on top of the Steem blockchain, has to be witnessed and processed by a set of people who create blocks, employing a consensus mechanism called a delegated proof of stake (DPOS). Witnesses run servers to a necessary specification for this task and are also required to produce a price feed, pooling price data from exchanges to ensure the correct value of Steem and Steem Dollars in the internal market. Put simply, without witnesses, Steem would not work.

The higher the rank of a witness, the more possibility of said witness in getting/produced a block. If no one voting for witnesses, the system will not work.

So please vote for 30 witnesses, everyone has 30 slots to fill.