What do a bug screen and a firewall have in common?

This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer.

Explainer

Firewall is like a bug screen, essential to defend our space against vermin intruders when we open the window. In order to save yourself from hosting the banquet of malware creepy-crawlies, secure your place. Use firewall.

Additional Context

The post is meant to emphasize the importance of fortifying the security posture in our lives.