Mobile learning, also known as m-learning, involves using mobile devices to access educational resources anywhere and anytime. It allows for continuous access to learning and interaction between students and teachers, even outside the classroom. Some key advantages include accessibility of content from any location, support for self-paced learning styles, and lower costs compared to computers. However, challenges include small screens that can cause eye strain, distractions from notifications, lack of standardization across devices, and limited memory and connectivity of mobile devices.