Public key infrastructures (PKI) are essential in cybersecurity as they provide a framework for managing digital certificates and encryption keys. PKI establishes a trusted environment for secure communications, ensuring data integrity and authenticity through digital signatures. It enables secure transactions and identity verification online, which is critical for e-commerce and confidential communications. By using PKI, organizations can safeguard sensitive data from threats while following compliance and regulatory standards. Thus, PKI plays a vital role in enhancing overall security in digital interactions.