**What is the contribution of online resources in modern UPSC preparation methods?**
Online resources have revolutionized UPSC preparation by providing access to a plethora of information. Video lectures, e-books, and online courses allow candidates to learn at their own pace and convenience. Websites and mobile apps dedicated to current affairs updates ensure that aspirants remain informed and engaged with contemporary issues critical for the exam. The availability of mock tests and interactive quizzes aids in self-assessment, allowing for targeted revisions. Online discussion forums and groups facilitate peer interaction, enabling candidates to share resources and insights. Thus, the digital transformation enhances flexibility, accessibility, and comprehensive coverage of the syllabus.