Question on Agile feet - Travel Domain

[Troy Loney]

Agile Feet (Su): As a free action, you can gain increased mobility for 1 round. For the next round, you ignore all difficult terrain and do not take any penalties for moving through it. You can use this ability a number of times per day equal to 3 + your Wisdom modifier.

The description says you ignore all difficult terrain for one round. So if there are spider webs, underbrush, bushes, slippery ground, squeezed spaces is that considered difficult terrain. I guess I need to know exactly what is considered difficult terrain.

[Dasrak]

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spider webs

These count as difficult terrain, but the other effects of the web above and beyond those of difficult terrain still apply as normal.

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underbrush, bushes

Yes, that's difficult terrain. You can move normally through it with this ability.

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slippery ground

This does not qualify as difficult terrain in and of itself. Slippery surfaces increase the DC of acrobatics or climb checks made on them. The grease spell does give predence that sufficiently slippery surfaces can reduce movement speed, but it does not actually say that it works like difficult terrain.

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squeezed spaces

No; although the rules are very similar to difficult terrain, it is not a form of difficult terain in and of itself.

Any obstruction that isn't significant enough to invoke a skill check or prevent movement altogether but does prevent you from moving through the square normally at your full speed is difficult terrain.