أركان الإسلام, developed by UnesDroid, is an educational Android application that offers a comprehensive guide to the five pillars of Islam. The term "أركان الإسلام" refers to the five fundamental principles on which the Islamic religion is based, and which are mentioned in the Hadith: "Islam is based on five pillars." The app provides a detailed explanation of each of the five pillars, which are:

1. Shahada (declaration of faith)

2. Salah (prayer)

3. Zakat (charity)

4. Sawm (fasting)

5. Hajj (pilgrimage to Mecca)

The app is user-friendly and easy to navigate, making it a great tool for anyone who wants to learn more about Islam. It is available for free and falls under the Education & Reference category, specifically in the Books subcategory.