By default, Google Analytics can only collect behavioral data from web-connected systems.
Google Analytics helps you capture and understand user behavior in most kinds of applications, including mobile apps (iOS and Android), web and SaaS applications, and IOT (internet of things) devices.
Read more here: https://support.google.com/analytics/answer/7126596
Understanding User Behavior with Google Analytics
The more you know about your users, the better equipped you’ll be to make smart choices about your website, mobile app, or SaaS (software as a service) application development investments. Measure what matters, from download and first use through usage, purchases, and loyalty. Google Analytics helps you capture and understand user behavior in most kinds of applications, including mobile apps (iOS and Android), web and SaaS applications, and IOT (internet of things) devices.
With minimal instrumentation, Google Analytics provides many pieces of information to help you understand the behavior of users as they interact with your site or application. Standard metrics include the number of users interacting with your application, the number of sessions those users create, and the screens or web pages that they visit.
User data in Google Analytics is captured using either first-party cookies, randomly generated IDs, or an SDK for mobile apps. On websites and SaaS applications, users can opt-out from Analytics by installing a browser add-on, and within mobile apps, they can change their settings to opt-out (if supported by the mobile app).
With additional instrumentation, you can gain an even richer understanding of how people interact with individual application screens or pages on a website. You can also add further instrumentation to capture more detailed interactions where needed using event tracking for granular interactions like those with video players, downloads, form submission, etc. You can also measure the number of important business actions that users complete (called Goal Conversions), as well as ecommerce transactions and purchases.