This is the memory that is lost when the computer is powered off, and the memory that is reloaded when the computer boots.
People download and install programs thinking they are truly free only to discover, instead, a free trial, or a free download (if you want to keep it past a certain length of time you’re required to hand over money).
It does a fine job of detecting malware, does so without adversely impacting system performance, and does so without nagging you for renewals, upgrades, or up-sells. In the past tools have differentiated between classes of malware such as viruses and spyware.
You would need a separate utility for each: one anti-virus program, and another anti-spyware.
Spybot Search and Destroy is one of the longest running and highly regarded anti-spyware tools out there.
Like Malwarebytes, it has also expanded to be a more fully-featured anti-malware tool.