[lug] Vim Modes Question

[Bill Thoen]

I'm trying to understand key mapping in Vim, but I don't understand what
Normal and Visual modes are. For example, if I define a key mapping with
cmap, it works fine when I press Esc and then : and then enter it. But I
don't know how to invoke key mappings created with nmap or vmap. So what
are Normal and Visual modes and how do I get nmap and vmap key mappings to
work?

- Bill Thoen