Nice work!
Definition 1 of 1
Pro Tip 1/3Positive Reinforcement
Use 'nice work!' to encourage others and acknowledge their effort positively. 
After reviewing her essay, I said, 'nice work! This is well-written.'
Pro Tip 2/3Informal Appreciation
'Nice work!' is casual and best used in informal or semi-formal situations. 
Seeing the clean room, Mom said, 'nice work cleaning up, kids!'
Pro Tip 3/3Team Acknowledgment
It's a way to recognize the collective effort of a group or team. 
The coach exclaimed, 'nice work everyone, that was a great practice session!'