What is the difference between Vanar and monkey?

I'm curious, could you elaborate on the distinction between Vanar and monkey? Are they two separate entities entirely, or are they related in some way? It seems that the term 'Vanar' is not as widely known as 'monkey', so I'm eager to understand the nuances that set them apart. Is there a specific context or culture in which the term 'Vanar' is used? I'd appreciate it if you could provide some clarity on this matter.