Floating - When the digital pin is disconnected from everything. Is the pin HIGH or LOW? Hard to say because there's no solid connection to either 5 volts or ground. The pin can be read as either one.
Pullup resistor - To deal with the above issue, connect a small resistor (10k Ohm) between the pin and 5 volts. This ensures the pin will have a weak connection to 5 volts and will be read as HIGH.
Sources:
Vilros Ultimate Starter Kit Tutorial Sketches 1-12
Vilros Ultimate Starter Kit Tutorial Sketches 1-12
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