Answer
Prepared statements compile SQL once and bind parameters later. They prevent SQL injection and improve repeated query performance.
Quick Answer
Prepared statements separate SQL from data. Use PDO prepare() with placeholder parameters (question marks or named placeholders). Call bindParam() or pass values directly to execute(). The database compiles the query once and runs it with different data. Parameters are never interpreted as SQL so injection is impossible. Use them for every query that includes user input.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ