What is the function of the chmod command in Linux?

The function of the chmod command in Linux is to change file permissions. It allows users to define who can read, write, or execute a file by modifying the permission settings associated with that file. Permissions can be set for the owner of the file, the group associated with the file, and others (everyone else). This command plays a crucial role in managing access control in a Linux environment, ensuring that only authorized users can perform certain actions on files, thereby enhancing the system's security. Understanding how chmod works is fundamental for effective file management in Linux, enabling users to maintain both functionality and security of their data.