Answer:
compression
Step-by-step explanation:
Bit rate refers to the size of an electronic object that is created digitally. As for example 2 kb, 4 mb for an image or document or video, etc:
Further the size can be reduced if the image is cropped, or the resolution is decreased.
By cropping the bite rate is reduced as now the object is smaller, or in case compression technique is used, the object tends to reduce in size again.
The resolution being hd or non-hd helps to reduce the size too.