The micro:bit micro-controller that is the "brain" of the MakerBit has a program that runs on it, which can operate without a computer attached, and in that mode, touching any touchpoint lights up an LED.
When connected to a computer with the USB cable, the MakerBit Media Linker app then can interact with the MakerBit hardware, and touching the touch sensors will not light up corresponding LEDs unless directed to by the Media List controls for Arriving at Media and End of Media. The MakerBit program is also compatible with other applications running on a computer that can operate with an Arduino, such as HyperStudio, Snap4Arduino, Firmata Test and others.
Most MakerBit interactive projects will use the MakerBit program installed on the micro:bit at the beginning of the MakerBit Tutorial, or re-installed if you've uploaded your own custom programs to the micro:bit, but then later want to return to normal MakerBit functionality.
A MakeCode program that did the basic action of a touch sensor turning on an LED (when not connected to a computer) this would look like this: