Are you looking for high-quality royalty free stock photos and videos? Pixabay has over 1.4 million available. Their content is under a Creative Commons CCO license. This allows you to use them without asking for permissions (because you already have it). It provides multiple filters including types of images, orientation, category, size, and color. Use these images to add visual appeal to a syllabus, email or an announcement.
Take a look – Pixabay