virus protection

hoosierdeb Said:

"virus protection: Yesterday I had a virus..."Your computer is low on memory..." -- kept popping up. Thought I had to deal with it today, but it seems to be gone. Does the MacAir have a program that detects and gets rid of malware??"

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There's no virus on your Mac.

RAM Consumption:

As for the message, it is telling you that an application or file or sorts is consuming lost of RAM. So, view the Activity Monitor, seeing what is consuming the most of it, and close whatever it may be. More on Activity Monitor: Activity Monitor User Guide - Apple Support

See my post from yesterday: News Streaming Sites Consuming Lots of RAM ( >4GB) - Apple Community

As @TheLittles has already outlined there are no virus that affect macOS. There is malware and adware that does. Though, malware and adware may sneak in when the User downloads software from Third Party Untrusted or UnReliable Developers and sites. For that problem, which is not what heaped to your computer, Malwarebytes is available and from a Trusted Developers and Reliable Contributor to these Forums.