Judy Jetson is the 16-year-old daughter of George and Jane Jetson who acts just like a normal teenage girl only with more futuristic tastes.
Despite Judy still keeping modern-day "teenage girl" likes and dislikes, such as seemingly never-ending conversations on the telephone and shopping for futuristic outfits, she does not live exactly like a modern teenager, obviously because of the time the show takes place, because she enjoys taking advantage of the many gadgets at her grasp because of the technology (like controllable zero-gravity switches made for accomplishing popular dance moves of the show's time or for other uses). She also gives a summary of how her day went including her problems to a floating robotic diary, appropriately named, "DiDi" (voiced by Brenda Vaccaro).
Judy is also very fond of a futuristic rock singer named "Jet Screamer", whom George at first despised until Judy won a date with the heartthrob singer in a contest in which girls who wanted to win a date with Jet Screamer were to write songs, and the writer of the winning song would win the date. Judy won because George replaced her original song with her younger brother Elroy's secret code. George came along to try to stop the date but failed and wound up as the drummer for the song and soon took a liking for Jet Screamer and his music.
Judy is depicted wearing a deep pinkish-purple, futuristic outfit and, like a few other Hanna-Barbara cartoon characters (such as Bamm-Bamm Rubble from The Flintstones and some background characters in various cartoons) has white hair that is colored to resemble platinum blonde or bleached blonde hair, which she wears in a ponytail on top of her head. She attends Orbit High School, which her father had also attended.
Judy was voiced by Janet Waldo in all appearances except Jetsons the Movie. After she finished recording her lines for the movie, Waldo's voice track was erased and rerecorded by pop singer Tiffany. Judy went unvoiced in her appearance in Harvey Birdman, Attorney at Law, due to the fact a voice actress could not be secured for her.