how can reduce the bandwidth while hosting?

whenever a person get message from the web hosting company that you have to reduces your bandwidth due to large size of the files then we have to manage the size of the files

Bandwidth means a space provided by the hosting company for a particular kind of site which can be given to the company according to the site work.

The larger size of the file, the higher level of the bandwidth usage when it is downloaded. The more traffic to our site, the morebandwidth you will use.

Bandwidth refers to the amount of data that can be transmitted in a particular amount of time. The “data transfer rate” is the speed through which data can be transmitted from one device to another.
Data rates are often measured in megabits (million bits) or megabytes (million bytes) per second.