What is the difference between trim and trim$ in vba? Accidentally today when I used left and trim functions in vba, The compiler said cant find project or library

When I googled it ,On one of the forum I found the user using like these

vba.trim("string")

He answered to prefix with vba for the functions. and surprisingly it worked on my pc too.But I found these functions

trim and trim$ left and left$ leftb and leftb$

I was wondering what is trim and trim$. I wanted to find the difference So I started to google it but the results are for trim ignoring the $ alphabet.