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A Pullup Resistor brings a line up to a voltage (Typically VCC), while allowing the line to be pulled low.

A Pullup Resistor brings a line up to a voltage (Typically Vcc), while allowing the line to be pulled low. Encountered in Open-Drain or Open-Collector systems, including I2C.

Threads with useful reading

A question on pull up resistors (switch with a pull-up resistor)
How do I calculate the required value for a pull-up resistor?
Is there a correct resistance value for I2C pull-up resistors?

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