What's the difference between Round() and math.ceil()....?

Question

I noticed they are kind of different when solving the halloween candy challenge

Answer 1

ceil(x) ---> Next whole number
floor(x) ---> Last whole number
round(x) ---> Closest whole number

Answer 2

The difference is with negative values...
Where round(-1.6) returns -2, math.ceil(-1.6) will return -1.
In other words: round rounds to the bigger abs value, ceil always rounds upwards...