Defintion: render - cause to become
When you render you cause your Blender design to become a picture. The computer takes a lot of time and energy when it makes your design a picture. Here is a way to make that happen faster.
Start Blender
Press the F10 KEY or press the Scene button.

We will be looking at the Render Window.

To speed things up we are going to render 50% of the picture.
Click on the 50%. 
Now when you render the picture will be smaller but will be seen quicker.