An Accessibility Service is a feature in the Android operating system designed to help users with disabilities interact with their devices more easily. These services can provide spoken feedback, screen magnification, or alternative input methods, making smartphones and tablets more usable for people with visual, auditory, or motor impairments. However, because Accessibility Services can control many aspects of a device, they are sometimes exploited by malicious apps to gain unauthorized access or perform harmful actions without the user's knowledge.