Which term describes the act of not allowing a value to change after it is set?

• A. Immutability
• B. IFrame
• C. Inner Join
• D. Integer

Answer: (A)

Immutability describes the property where once a value is created, it cannot be changed. If you set a value and disallow any modification to it, you’re dealing with immutable data. This concept is common in many languages—strings are often immutable, so attempting to modify them results in a new value rather than changing the original. Languages enforce immutability with features like const or final declarations, or by using immutable data structures.

The other terms don’t fit because they describe unrelated ideas: an IFrame is an HTML element for embedding content, an Inner Join is a SQL operation that combines rows from two tables, and an Integer is just a numeric data type, which can be reassigned or changed depending on how the variable is declared.