With the all-time popular Naruto anime series ending in 2017, the fandom has often reflected on several characters from the series. With many unique characters and a wide variety of abilities, the series' vast universe has one of the most extensive narratives to have ever been written.
Among several characters from the mangaka Masashi Kishimoto's popular series, one unique character has been often revisited by the fans. The character in discussion here is Karin Uzumaki. Fans have often asked regarding Karin and Sasuke, "Why does Sasuke bite Karin?" Sasuke bites Karin to access her chakra for healing purposes, one of her main abilities.
Disclaimer: This article contains potential spoilers from the Naruto series.
Karin Uzumaki's healing ability and potent lifeforce, explained
Being a direct descendant of the Uzumaki Clan in the Naruto series, Karin Uzumaki possesses a remarkable life-force, giving her immense longevity, a huge reserve of chakra, and vitality. The life-force inherited as a member of the Uzumaki Clan also grants Karin powerful healing capabilities, which she uses to mend wounds and regenerate quickly.
Karin can also heal herself tremendously fast by biting herself and consuming some of her chakra. While she was a member of Team Taka, a team founded by Sasuke consisting of him, Karin, Suigetsu, and Jugo, Karin used her healing powers on Sasuke, letting him bite her arm to transfer her healing chakra.
While she has immense reserves of chakra and can provide a huge amount of chakra to heal herself or others, there is also a minor drawback to Karin's ability. If used more than once per day, Karin's body is left with presumably permanent bite marks that cannot recover on their own.
Karin's other powers and abilities in Naruto

While that answers "Why does Sasuke bite Karin?" primarily being a non-combatant character from the series, Karin possessed prowess in sensory perception, ninjutsu, and even taijutsu, as seen in several instances from the series.
Karin has incredible sensory perception known as the Mind's Eye of the Kagura, allowing her to sense others' chakra signatures from a distance. Unlike other sensory-type chakra users who depend on moulding chakra beforehand, Karin can detect chakra signatures without conscious effort. Moreover, she can even sense the reserve of chakra her target possesses, along with its potency.
Originating from the Uzumaki Clan, Karin can materialize the iconic Adamantine Sealing Chains ninjutsu, however, she can only use an incomplete version of the jutsu. During Naruto's Fourth Shinobi World War arc, Karin used the jutsu to destroy Tobi's giant wooden statue and its several arms.
Karin also shows proficiency in other ninjutsu techniques like earth, water, Yin, and Yang chakra releases. She is also shown using the Mystic Palm technique, a medical ninjutsu technique mastered by Tsunade and Sakura. However, her skill in using the technique has been left unclear as per the series' narrative.
As mentioned previously, despite being non-combatant, Karin also showed instances where she used physical traits hinting towards taijutsu. Her nimble movements and efficiency in dodging Tobi's wooden statue's attacks prove more of her physical capabilities.
Final thoughts
This article answers the question, "Why does Sasuke bite Karin?" Her powers and abilities are further explored in this article to provide suitable context against the question. Despite her featuring rarely in the series, she played some key, pivotal roles in the narrative of the series.
With the Naruto anime already concluded, Karin appears in the sequel series Boruto: Naruto Next Generations. While she rarely appeared in the main series, the sequel focuses more on her character and abilities.
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