nested for loop dilemma

[YoungGrassHopper]

for row in range(10):
    for brick in range(row + 1):
         print('#', end = ' ')
    print()

Yay! haha..

for row in range(1,10):
    for column in range(1,row + 1):
         print(row * column , end = ' ')
    print()
        

its the first time I see "end" used like that in the inner print line, how does it work if its not defined in the code? neither do I see its coloured like other commands but yet it has a function? can you please explain how it works if you don't mind?