Instructional Technology & Design  Definition

According to the Association for Educational Communications and Technology (AECT) (2008), educational technology is "the study and ethical practice of facilitating learning and improving performance by creating, using, and managing appropriate technological processes and resources" (p. 2). 

My own definition would be paraphrasing  Reiser & Dempsey (2018), who state that instructional design and technology encompasses the analysis of learning and performance problems, and the design , development , implementation , evaluation and management of instructional and non-instructional processes and resources with the purpose to improve learning and performance in a variety  of settings, particularly educational institutions, and the workplace.