What will be the output of `print('5' + '5')`?

In Python, when you use the + operator with strings, it performs string concatenation. This means that it will combine the two strings into one single string rather than performing any arithmetic operation.

In the expression print('5' + '5'), both operands are strings: the first '5' and the second '5'. Instead of adding the numerical values, Python treats them as sequences of characters. Therefore, when they are concatenated, the result is a new string that combines these characters together.

So, '5' + '5' results in '55', which is why the output of that print statement is '55'. This illustrates the concept of string concatenation in Python, which is distinct from numeric addition.