We often overlook the security of our Android devices by allowing unrestricted internet access. An Android firewall can block specific apps from accessing the internet, preventing unwanted data usage and ads. Droidwall was an effective early firewall but required root access. Mobiwol is a popular alternative that does not require rooting. It allows users to control which apps can access the internet when active or inactive. Having a personal Android firewall is important for protecting private information from malicious software and unwarranted access when browsing online. A firewall can prevent data leakage and ensure user privacy and security.