The name used for personal data protection laws in countries such as Saudi Arabia and the UAE, governing how data is collected, used and kept.
PDPL stands for Personal Data Protection Law. Saudi Arabia has a Personal Data Protection Law overseen by the competent authorities, the UAE has a federal personal data protection law, and other countries in the region have their own. These laws generally cover the basis for collecting data, data subjects' rights, security and conditions for transfers.
Any app that collects names, phone numbers, addresses or health data falls under these rules. That usually means a clear privacy policy, collecting only what you need, appropriate protection and honoring customers' requests about their data. Violations can bring penalties and damage your reputation.
Practical tip: this is a general definition, not legal advice. Check the official text of the law and its regulations in your country and the supervising authority's guidance, and consult a professional. Read the personal data guide as a starting point.