As fdmaxey explained ,it could be both countable and uncountable as the case with many other nouns. Here is a list of common uncountable nouns: http://www.jamesabela.co.uk/genmaterials/CommonUncountableNouns.pdf

If you use it to mean the study or collection of technologies, it is uncountable. When it refers to a particular technological concept, it is uncountable. "Technology has improved most peoples lives." (uncountable) "Using new drilling technology, they were able to access the oil deposits." (countable) Some uncountable words would be: music, art, love, happiness advice, information, news furniture, luggage rice, sugar, butter, water electricity, gas, power money, currency