Aluminum profiles are joined together using several types of connectors, each serving specific purposes in assembly. Common types include: 1. T-slots and T-nuts, which provide a secure and adjustable connection. 2. Corner brackets, used to join profiles at right angles. 3. Angle connectors, for joining profiles at various angles. 4. End caps, used to cover the ends of profiles. 5. Clamps and brackets, for securing profiles in place. 6. Hinges, allowing for pivoting connections. 7. Cylindrical connectors, for joining round profiles. 8. Specialized connectors for specific applications, such as cable management or modular systems. These connectors are crucial for creating robust, modular structures in various industries.