A low catch is a catch taken very low, just above the ground.
an easy catch
under old planks
And there's more
chaminda vaas
There is no restriction on whether you can catch the ball one handed or two handed in a cricket match. If you gather the ball on the full (without bouncing) and manage to hold onto it, you have claimed a catch. However, if the delivery is illegal (a no ball), then it is not considered a catch.
no
5 secs
rahul dravid
Jonty against NZ in NZ early 2000
Tendulkar
to the left
A batsman edging the ball and keeper takes his catch is caught behind