The top one is correctly identified in the other answer as a Begonia - it's actually Begonia coccinea, commonly known as Angel Wing Begonia https://www.houseplantsexpert.com/angel-wing-begonia.html. The second plant, also as already said, is a Dieffenbachia https://www.houseplant411.com/houseplant/dieffenbachia-dumb-cane-plant-how-to-grow-care-for-a-dieffenbachia
Neither of these plants appreciates direct sunlight; in the case of Dieffenbachia, medium to good day light is what's required - very bright light and direct sunlight will cause bleaching of the leaves; in front of a south facing window is not a good position for either of them, better to choose a window facing any other direction.
With regard to the Begonia, it appears to be in a tiny pot in comparison to the its topgrowth - it looks to be lanky, with lots of bare stem showing with no leaves except at the top, most likely because it doesn't have enough root room. I suggest you find a bigger pot for it, one with drainage holes in the bottom, and repot using new potting soil, as well as cutting it back to encourage new leaf growth off the bare stems. It's better to cut back hard in spring really, but without cutting it back, you'll still be looking at bare and lanky stems, so I'd cut it back by at least half now - I can see a growth bud on one of the stems (that little, pointy, orangey looking blob visible in the picture) so cutting back to just above that should encourage it to 'break' and grow new leaves.