# Introduction Why do we need variables in computer programming languages? This is an age-old question. Just as we can remember that the URL for the LabEx is `labex.io`, computer programs also need to remember some data for their use. The purpose of variables is to represent a piece of data. In this section, we will explore how variables are used in the Go language. **Knowledge Points:** - Variable declaration - Variable initialization - Variable usage - Variable lifetime - Constants
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