The video is a webinar hosted by Trinity College London about the importance of being assessment-literate. The speaker emphasizes the difference between assessment and testing, explaining that assessment is a broader concept that encompasses various methods for evaluating student performance, while testing is just one tool within assessment. The speaker also highlights the importance of formative assessment in informing teaching practices and providing feedback to students. The webinar concludes with a discussion on the importance of communicating the purpose of assessments to both students and parents.