Students have likely heard a lot of terms about CS: programmer, hacker, software engineer, coder, computer scientist, or developer. To demystify CS, explain that the differences between these terms aren’t particularly important. Help students see that CS has a lot of specialties with different balances of programming, design, math, and problem solving.
Example: "There are lots of names to describe doing CS!"
See this and related tips as a Tip Sheet: http://csteachingtips.org/Tips-for-introducing-computing