Identically means in exactly the same way, without any differences at all. When two things are done identically, they match perfectly in every detail.

If you and your friend solve a math problem identically, you use the exact same steps and get the same answer. If twins dress identically, they wear matching clothes from head to toe. Scientists conducting experiments need to repeat their procedures identically to make sure their results are reliable and not just lucky accidents.

The word emphasizes complete sameness. Two essays might be similar, but if they're written identically, they'd have the same words in the same order. Two snowflakes might look alike, but famously, no two form identically because tiny differences in temperature and moisture create unique patterns.

You'll often see identically in situations where precision matters: “The two watches were set identically, to the second” or “The recipe must be followed identically each time.”