Is website really required to do a business?

Answer 1

it makes good impression on your customer.

Answer 2

It is not really required to do a business. There are a lot of ways to do a business. But having a website will make it easier for customer, gonna-be-customer, or visitor to know what your business is about.
It can be also your business advertisement.
In summary, it helps you to do self-advertisement and self-introduction to people about your business while you are concentrating to do other stuff.

Answer 3

If you have to ask that question, there is no way you are ready to even think about running a business.
Take a business management course, or get some business management info online. thinkingmanagers.com has some good stuff