Yes, it is always positive. 0 K is the lowest temperature there can be.
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The objects Kelvin temperature. The Kelvin scale starts at absolute zero (-273 degrees Celsius)
Its Kelvin temperature. The Kelvin scale starts at absolute zero and goes up. Absolute zero on the celsius scale is -273.15oC
It is an absolute measurement scale of temperature. 0K is absolute zero there are no negative units on the scale (degrees centigrade [celsius] + 273 = degrees Kelvin). This also is the case on the Rankine temperature scale (degrees fahrenheit +459.69 = degrees Rankine)
Kelvin has the advantage that it is an absolute temperature scale - it starts from absolute zero. This simplifies several calculations; for example, in an ideal gas, at constant pressure, the volume of the gas is proportional to the absolute temperature. Similarly, calculations related to heat machines are simpler if an absolute temperature scale is used.
Many, but one example is the Kelvin Temperature Scale whose 0º is Absolute Zero.