What Even Is a Language?

Where do we draw the line between "language" and "dialect"?

Click here for the video of Scots:
http://www.youtube.com/watch?v=cENbkHS3mnY

Things from this video I didn't make:
Picture:
http://en.wikipedia.org/wiki/Africa#mediaviewer/File:Africa_(orthographic_projection).svg
Intro Song:
https://www.youtube.com/watch?v=AWXvSBHB210
Fakoutro Song:
https://www.youtube.com/watch?v=Is4EOvK32vU
Outro Song:
https://www.youtube.com/watch?v=oCDbm5VWDwg

Видео What Even Is a Language? канала Xidnaf