Product-led growth (PLG) is a strategy that emphasizes creating an easy-to-adopt product that allows customers to sign up, try it for free, and eventually transition to a paid plan as they find value in it. This approach relies heavily on the quality of the product to attract and retain users, with notifications playing a critical role in maintaining engagement and facilitating growth loops. Key notifications that support PLG include invite notifications, access request notifications, and referral notifications, which help users share the product with others and encourage new user participation. While self-service is a significant aspect of PLG, it is often complemented by a sales team to maximize customer value. Notifications are particularly important because they reach users even when they are away from the product, thus playing a vital role in driving growth and engagement. Knock provides solutions to streamline the implementation of these notifications, helping product teams focus on building core features while maintaining effective communication with users.