[amoeba]

depends on the flop.

often this is a draw looking to get to the turn for cheap, maybe fold missed overs from a tight preflop raiser. its either that or something like second pair on the flop.

I often raise here. their actions on subsequent streets will let you know where they are.

note that there is a danger with a hand like AK in these situations as fish at lower limits often call preflop raises with ace little, so if they pair their kicker on the flop, you are drawing to 3 outs not 6.