Need this question answered urgently, please someone help me out, I will gladly upvote.

The director of sales has asked the CIO of the company to remove the firewall where sales transactions occurred online as he believes that the firewall is restricting legitimate sales from occurring online. Is the director of sales correct? Is it is possible for a firewall to restrict legitimate data flow?.

Required:

Explain what a firewall is and what it is intended to accomplish. Identify if the director of sales correct. Is it is possible for a firewall to restrict legitimate data flow?