View-Master is a toy that you can look into and see different pictures. It looks kind of like binoculars, but instead of seeing things far away, you see pictures inside.
When you look through the viewfinder of the View-Master, you will see a circular wheel with lots of tiny pictures on it. There are different reels with different pictures that you can switch out. When you turn the wheel, it changes the picture you see through the viewfinder.
The pictures inside the View-Master are called "reels". The reels are made up of many small color pictures. When you put a reel in your View-Master, you can see these small pictures through the viewfinder. The pictures look like they're in 3D, which means they look like they're popping out at you!
View-Master has been around for a really long time. It was invented in 1939, which means your grandparents or even great-grandparents might have played with it when they were little. Nowadays, View-Master has lots of cool reels about different places in the world and different movies and TV shows. Some people even collect them as a hobby!