ST_Intersects vs. ST_Touches

[<cyw@xxxxxxx>]

What are the differes between ST_Intersects  and ST_Touches?

The 1st query return something, but the 2nd return 0.

 

select road.link_id from road where
Intersects (
 Buffer(GeometryFromText('POINT(-88.02083 41.956982)',4326), .001),
 the_geom
) 

 

select road.link_id from road where
Touches (
 Buffer(GeometryFromText('POINT(-88.02083 41.956982)',4326), .001),
 the_geom
) 

 

Thanks.

_CYW_