could be related to any of these.
Photography and optics
- Microscope slide - a thin glass sheet used to hold objects for examination.
- Photographic slide or transparency - a thin translucent photograph bound in paper, plastic or similar frame and often used for projection with use of a slide projector for a slideshow.
- A slide edit - a video editing term for moving a clip around in a timeline.
- Slide.com - a website that offers groups the ability to discover, share, and talk about photos together.