Is it possible to do sound and voicewithin Blender?

I’m learning Blender and am curious if its possible to edit sound within Blender. One particular area that I’m curious about is the ability for Blender to match recordings of voices with the character’s mouth/face; is that possible too?

Yes you can use the VSE (sequencer) to edit sound. youo can do multiple tracks (mixing) and sync playback with scenes for animation timing.

Is it all manual or there’s some automation? What is VSE?

You can automate everything using Blender’s keyframes and ipo-curves. And VSE means Video Sequence Editor.

So what exactly would you use VSE for? I know its for videos but wish for more info. What are ipo-curves?