Computing
- Class (computer programming), or type of object, a fundamental concept of object-oriented programming
- C++ classes, program-specific data types
- Java class file, the interpretable bytecode of a compiled Java program
- Class attribute, a feature of many HTML and XHTML elements, typically to identify them for styles
- Complexity class, a set of problems of related complexity in computational complexity theory
- Class (warez), a defunct group in the warez scene
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