A CSPRNG is a type of pseudorandom number generator specifically designed for use in cryptographic applications. Unlike standard PRNGs, a CSPRNG produces output that is not only statistically random but also unpredictable, even if some of its internal state becomes known. This unpredictability is crucial for security tasks such as key generation, encryption, and digital signatures. CSPRNGs use algorithms that withstand cryptanalysis, ensuring that attackers cannot feasibly determine future or past outputs from observed values. Proper implementation and seeding are essential to maintain their security properties.