Daily Active Users (DAU) is a metric used in the tech industry to measure the number of unique users who actively engage with a product, such as a mobile app or a website, on a daily basis. DAU is an important metric for companies to track as it provides insight into the usage and engagement levels of their product and can help identify trends and patterns over time. By measuring DAU, companies can understand the level of adoption of their product and make informed decisions about product development and growth strategy.

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Weekly Active Users (WAU) is a metric used in the technology and digital industries to measure the number of unique users who actively use a particular product, service, or platform on a weekly basis. It's a commonly used indicator of engagement and usage, and is often used to track the growth and success of a product or service over time. The metric can be used to measure the popularity and reach of various types of digital products, including mobile apps, websites, and online communities. By tracking the number of weekly active users, companies can gain insights into how their products are being used and identify areas for improvement to enhance the user experience.

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Monthly Active Users (MAU) is a metric used to measure the number of unique users who actively use an app, website, or platform within a given month. It is a commonly used indicator of the user engagement and popularity of a digital service. The metric is used by many companies to track the growth and success of their product, and to make informed decisions about future development and marketing strategies. The calculation of MAU typically involves tracking the number of unique accounts or devices that have made a request to the service during the past 30 days. The goal for many companies is to have as high an MAU as possible, as it is a strong indicator of customer engagement and loyalty.

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Quality of Experience (QoE) refers to the overall enjoyment or satisfaction a user experiences when interacting with a system or service, typically in the context of multimedia and communication technologies. It encompasses all aspects of a user's interaction with a system, including technical factors such as performance, reliability, and usability, as well as subjective factors such as content quality, personal preference, and context.

QoE is important because it provides a measure of how well a system or service is meeting the needs and expectations of its users. By understanding and improving QoE, companies and organizations can develop better products and services that are more likely to be used and preferred by their customers.

There are various methods for measuring QoE, including questionnaires, subjective ratings, and objective metrics. The specific approach used will depend on the type of system or service being evaluated, as well as the goals and constraints of the evaluation.

https://www.techtarget.com/searchcustomerexperience/definition/Quality-of-Experience-QoE-or-QoX

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(DAU) Daily Active Users