Mobile Application Penetration Testing assesses the security of Android and iOS applications by analysing application binaries, runtime behavior, local data storage, cryptographic implementations, and communication with backend services. The assessment evaluates how securely sensitive data is stored and transmitted, how authentication is implemented, and how resistant the application is to reverse engineering and tampering. Testing includes static and dynamic analysis, reverse engineering, runtime manipulation, and backend API interaction testing. The methodology follows OWASP Mobile Top 10, OWASP MSVS, CERT-In guidelines, and CREST standards, ensuring alignment with industry and regulatory expectations.