Stalkerware (spyware) can monitor your smartphone to record your location, which websites you visit, and the apps you use. Stalkerware can also record all of the keystrokes you make on your phone, meaning it can record all of the text you enter, including texts, emails, and login/password information,
Many times, stalkerware is installed by a nosy spouse to track their partner and their actions. It can also be installed by parents on their offspring's phones to monitor their actions. Organizations also install it on employees' phones to ensure company-provided devices are used properly.