difference between concatenation and string.append() in a list

Question

what is the difference between concatenation and string.append() while both does same operations

Answer 1

Append adds element to the end of the list, concatenation chain elements in order it is.

Answer 2

One of the main differences might be that string.append() doesn't exist. Correct me if I'm wrong

Answer 3

concatenation means simply add two string and you get new string.
x='solo'
y='learn'
print(x+y) #output=sololearn

and remember here is no append method for string it is uses for list to append the value in the list at last index.
x=[1,2,3]
x.append(4)
print(x) #output=[1,2,3,4]