There are many mobile apps that can facilitate communication and collaboration among learners, depending on the purpose and context of the learning activity. For example, Google Classroom is a learning management system that enables users to create and join online classes, assignments, and discussions. Through this app, you can communicate and collaborate with your teachers and classmates by submitting your work, giving and receiving feedback, and participating in live chats and video calls. Kahoot! is a game-based learning platform that allows you to create and play quizzes, polls, and puzzles with your peers. Padlet is a digital bulletin board that enables users to create and share multimedia content such as notes, images, videos, and links. It's ideal for brainstorming, presenting, and commenting on different ideas and projects. Lastly, Flipgrid is a video discussion platform that allows users to create and share short videos called grids. Through this app, you can record, watch, and respond to each other's videos on various topics and questions.