Can you explain what the term 'available' means in the context of memory status information?

In the context of memory status information, the term "available" usually refers to the amount of memory that is accessible for use by applications and the operating system without the need for freeing or swapping. It is not just free memory, but the sum of free memory and memory that can be quickly freed, such as cached data or buffers that the system can clear if necessary.

For example, in Linux, the free command shows the "available" field, which considers not only free memory but also cache and buffers that can be used without significantly impacting performance.