In programming and mathematics, a **constant** is a value that cannot be altered during the execution of a program or within a particular context. Constants remain fixed and unchanged throughout the program's lifecycle, distinguishing them from variables, which can hold different values at different times. ### Characteristics of Constants: 1. **Immutability**: Once defined, a constant's value cannot be modified. 2. **Naming**: Constants are often named using uppercase letters or specific naming conventions to denote their immutable nature.
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