If I am using an antivirus package such as Avast, do I also need a firewall?

Question

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Answer 1

 Web Shield protects from web-based attacks (when you browse the web). The firewall protects from attacks at a different level. 
For example, exploiting network shares or other open processes. 
For safe browsing, both are required. I am not sure if Firewall is included in the free version of Avast, though. It might be.

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