Pass PHRASES are much better anyway.
Nobody's gonna remember "pyf85ruGmmgรฆ&Oy_w48euaT0lt" so they'll either write it down, save it to their browser,or use a password manager, either of which makes it less secure.
On the other hand, something simple that doesn't necessarily make sense, say "AlmondsMakeFineGrenades" is difficult for both humans and machines to guess, but easy to remember.
Tl;Dr: an xkcd comic explaining it much better than I just did ๐