Which tool is commonly used in educational contexts to engage students online?

Blackboard is a widely recognized learning management system (LMS) that facilitates online engagement between educators and students. It provides features such as discussion forums, assignment submission, grade tracking, and content management, making it an effective platform for both in-person and remote learning environments. By centralizing resources and enabling communication, Blackboard helps enhance the educational experience and encourages interaction among students and between students and instructors.

In contrast, optical mail scanners, RFID technology, and automatic toll booths serve very different purposes. Optical mail scanners are primarily focused on processing physical mail, RFID technology is used for tracking and identifying items through radio waves, and automatic toll booths are related to vehicle toll collection. None of these options are designed with the specific intent to create an interactive and engaging learning environment, which is why they would not be effective tools in educational contexts compared to Blackboard.