The text provides a comprehensive overview of code signing, emphasizing its importance in securing the software supply chain against cyber threats. Code signing involves applying digital signatures to software components to verify their authenticity and integrity, ensuring that applications are not tampered with by unauthorized parties. The article details the code signing process, which includes creating a public-private key pair, hashing, and verification, to maintain the security and authenticity of software. It also highlights the role of code signing in major platforms like Apple's App Store and Google Play Store, where it is mandatory for application distribution. Best practices for code signing, such as securing private keys, using automation with CI/CD pipelines, employing timestamps, and scanning for vulnerabilities, are discussed to enhance software security. The text concludes by stressing the significance of code signing in protecting against vulnerabilities and unauthorized changes, advocating for integrating these practices into the software development lifecycle to ensure robust application security.