Habits are automatic actions based on past experiences that help conserve brain resources, making changing habits difficult.Businesses benefit from habit-forming products as they drive user engagement and loyalty.Nir Eyal's Hooked framework outlines a four-stage cycle for forming lasting habits starting with triggers.External triggers are clear calls to action like adverts, while internal triggers stem from emotional states.User actions are based on motivation, ability, and triggers, with reward variability playing a key role in user engagement.Investments in a product make it more valuable, leading to increased commitment and habit formation.Spotify's successful application of the Hooked model includes external triggers, internal triggers, simple actions, and variable rewards.Users invest time, effort, data, and money in Spotify, contributing to its success as a habit-forming product.Spotify's personalised experience, social elements, constant discovery, data utilization, and low barriers to action are key to habit formation.Ethically applying the Hooked model can lead to sustainable user habits and high retention rates, as seen in Spotify's case.