Final answer:
Strings being immutable means that once they are created, they cannot be changed; any modifications result in a new string in memory.
Step-by-step explanation:
When we say that strings are immutable objects, we are referring to the property of strings in programming where once a string is created, it cannot be changed. In languages like Python, for example, if you try to alter a string, you are actually creating a new string in memory rather than modifying the original string. This is because strings are designed to be immutable for reasons such as optimization and security. The content of the string remains the same throughout its existence, and any operation that seems to 'change' the string, actually returns a new string with the desired changes.