In the context of aviation and aerospace, "Autobrake" refers to a system that automatically applies the brakes to an aircraft's wheels after landing, in order to slow down the aircraft and bring it to a stop. The Autobrake system is typically found on modern commercial aircraft and is designed to reduce the workload of the pilots during the landing phase, as well as to improve safety and reduce the risk of accidents.

The Autobrake system uses a combination of sensors and computer algorithms to determine the optimal braking pressure and timing, taking into account factors such as the aircraft's weight, speed, and runway conditions. Once the system is activated, it automatically applies the brakes in a controlled manner, allowing the pilots to focus on other aspects of the landing, such as maintaining directional control and monitoring the aircraft's systems.

Autobrake systems typically have multiple modes, which can be selected by the pilots depending on the specific conditions of the flight. These modes may include:

1. Low: A low-level of braking, used for dry runways or when a long rollout is desired.
2. Medium: A moderate level of braking, used for most normal landing conditions.
3. High: A high level of braking, used for short runways or when a high-rate of deceleration is required.
4. Max: The maximum level of braking, used in emergency situations or when a high level of braking is required.

Overall, the Autobrake system is an important safety feature that helps to reduce the risk of accidents and improves the overall efficiency of the landing process.