Glossary — Q
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Query
A request to a database for data. In SQL: SELECT * FROM users WHERE active = true; — that’s a query. Loosely, “query string” or “query parameters” also refers to the part of a URL after the ?: in https://example.com/search?q=cats, q=cats is a query parameter.
Queue
A first-in-first-out (FIFO) data structure. Things added at the back, removed from the front. Like a queue at a coffee shop. Used in computing for job processing, message passing, and rate limiting.
See also: Data structures
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