Oura Ring is a wearable technology brand that offers an advanced sleep and activity tracker in the form of a stylish ring. The Oura Ring measures various physiological signals of the user's body, such as heart rate, temperature, and movement, to provide personalized insights and guidance on sleep, recovery, and overall health. The ring's scientifically validated tracking and analytics help users understand their body's needs and make informed choices to optimize their daily routines and well-being.