Burst, or continuous high (low) speed, is a particular shooting mode (feature) found within the camera settings; although not all cameras are equipped with this feature.
Burst, or continuous high speed, allows you to photograph images in quick succession by continually keeping pressure on the shutter button.
This means that instead of taking one shot at a time, as you maintain pressure on the shutter button multiple shots will be taken in succession.
This is often preferred to the single shot setting, and is often used when the subject is in motion; for example birds or sports photography.
You may love it or may not, as there will be times you capture “the shot,” and other times it will be missed.