What is Cognitive Load?
Cognitive load is the amount of effort required during reasoning and thinking. Cognitive load theory states that since short-term memory is limited, learning experiences should be designed to reduce the working memory 'load' to promote schema acquisition.
Cognitive Load Theory (CLT) is a scientific approach to the design of learning materials, so you can present information with speed and a level of complexity that people can easily understand. When the cognitive load is high, thought processes potentially interfere, thus the design interface aims to keep the cognitive load of the users to a minimum.
Cognitive load theory provides a general framework with broad implications for instructional design, allowing designers to control learning conditions within the environment, within most instructional material.