A code signing certificate is a digital certificate used by software developers to sign executables and scripts. This process attaches a cryptographic signature to the code, verifying its origin and integrity. When users download or install signed software, their operating system or browser checks the certificate to confirm the software has not been altered and comes from a trusted source. Code signing certificates help prevent tampering and reassure users that the software is legitimate. However, if a certificate is stolen or misused, attackers can sign malicious code, making it appear trustworthy and bypassing some security warnings. Therefore, protecting code signing certificates is crucial for maintaining software security.