What Is Blue Tape:
It's designed to be used for masking away (or hiding) areas that will not receive paint when painting home interiors. For example, you might mask away white crown molding when painting your home's walls. Old-school beige masking tape had a nasty tendency of a.) tearing when removed, and b.) pulling off paint below or even drywall facing paper. Blue tape is stronger, thus it is more difficult to tear. Its low-stick adhesive ensures that the underlying surface will not come off, either.
Avoid any masking tape that does not advertise its "low-stickability" for masking interiors.
Blue Tape, Green Tape, Purple...Any Color Tape:
Time Limits For Removal:
Uses Other Than Painting:
As one example, you can use it for drilling pilot holes when attaching cabinet hardware. Applying tape prior to drilling will help mitigate splintering, and will protect the cabinet if the drill bit slips.
It's also used for affixing drop cloths to flooring or door frames.