What is a habit loop (Hooked model)?

Habit loop (Hooked model) is a cycle of habit formation described in Nir Eyal's book "Hooked." It consists of four main elements:

1. Trigger — a signal or stimulus that initiates behavior. It can be external (notification, advertisement) or internal (emotion, thought).

2. Action — the behavior performed by the user in response to the trigger.

3. Reward — a positive outcome or satisfaction that the user receives after the action. It reinforces the behavior.

4. Investment — efforts or resources that the user puts in, increasing the likelihood of repeating the cycle in the future (e.g., creating an account, accumulating points).

This model helps create products and services that foster sustainable habits in users, increasing engagement and loyalty.