A cable booster also known as a jumper cable is used to connect with a discharged battery to a power source to jump start the vehicle. This is used when your vehicle can't start up.

Yes, a booster is an amplifier. There are several types, some with multiple outputs, some with only one output.

around a 100m

88 Has a cable it a two section cable located underneath the master cylinder brake booster area

A television booster is used for strengthening signals transferred through the cable to the television set. It can also be used to boost the weakened signal transferred through antenna and cable so one can have better picture and sound on one's television.