What are the duties of the vice president

The vice president has to act as the officer of the senate.
He/she must be familiar with all the presidents priorities and duties so that if anything happens, he/she is able to take on the roll of president. They also are an "assistant" for the president, and helps with making decisions for the country. 

Existing to a lot of people

Idon't think any of em are right, you need to add the number of what paragraph you got your citation from