The word "slide" is used when there’s not a lot of friction and something can move very easily. Sometimes this movement is uncontrollable, which is a bad thing; however, there are good reasons for making something slide.
This is how the word "slide" can be used as a verb:
Drawers in the kitchen slide in and out for convenient storage.
Dresser drawers also slide in and out.
Some doors in a house can slide open and slide shut.
You can slide a CD or a DVD into your computer. When you push a button, it slides out.
In the wintertime, use a sled to slide down hills. It’s a lot of fun.
Your car might slide on ice and snow in the winter. That’s not a good feeling.
My car slid into a telephone pole during a snowstorm. (The past tense of "slide" is "slid.")
Trombone players slide a metal piece back and forth when playing music.
This next set of sentences shows how "slide" is used as a noun:
Children like to go down the slide at the park.
A slide can be very useful when moving things short distances.
When I was a kid, we used to look at slides on a projector. The slides showed an image on a screen. Now we use computers and cell phones to look at pictures.