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What are C++20 ranges? What is a view in the ranges library? Which header provides ranges and how do you use range algorithms? What does the pipe operator | do with ranges? What are some commonly used range adaptors? What is the difference between a range and a container? How does lazy evaluation in views affect performance and behavior? What is a projection in range algorithms? What are the range concepts (input_range, forward_range, etc.)?
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How do ranges make code safer than iterator pairs?

Beginner

Answer

Passing begin()/end() from different containers, or in the wrong order, is a classic bug that ranges eliminate by taking a single range object. Range algorithms also support projections and are constrained by concepts, giving clearer error messages. The whole-range interface is harder to misuse.
std::ranges::find(v, target);  // can't mismatch begin/end
Real-world example A subtle bug from mixing two containers' iterators is impossible once code uses range algorithms.

Common follow-ups: What iterator bug do ranges prevent? | What is a projection?

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