A software supply chain attack is a type of cyberattack where hackers target the software development process instead of attacking the end product directly. Attackers compromise tools, libraries, or third-party components that developers use to build software. By inserting malicious code or altering legitimate software updates, they can infect many users or organizations when the compromised software is distributed. These attacks are particularly dangerous because they can bypass traditional security measures and affect trusted software before it reaches end users.