What's the difference between biogas and biodiesel

I found these two forums:
https://permies.com/f/112/biogas
https://permies.com/f/113/biodiesel

I don't know what is different between biogas and biodiesel.  Can anyone give a sentence about each that we could stuff at the top of the forum?

Biodiesel currently has "and veggie oil as fuel" which doesn't really tell me what it's about either.

biogas:
biodiesel:

Biogas is produced from decomposition of organic matter, usually in a digester of some sort. It is a literal gas, primarily methane and CO2. Think propane substitute.



Biodiesel is refined via chemical reaction from veg oil; methanol+lye are combined to make 'methoxide', which is mixed with the veg oil in a reactor; this then separates into biodiesel, glycerin, and some other minor byproducts.

It is a liquid fuel, compatible with pretty well all applications where diesel is used.



Too long, but that's what I've got right now..

Thank you
I updated the forums.