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The excavator might employ relative dating, using objects located stratigraphically (read: buried at the same depth) close to each other, or he or she might compare historical styles to see if there were similarities to a previous find.
But by using these imprecise methods, archeologists were often way off.
Archaeologists can then measure the amount of carbon-14 compared to the stable isotope carbon-12 and determine how old an item is.
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For the most part, radiocarbon dating has made a huge difference for archaeologists everywhere, but the process does have a few flaws.
For example, if an object touches some organic material (like, say, your hand), it can test younger than it really is.