Quick verdict
WhatsApp Messenger and Telegram both sit at the top of the Communication app charts on Google Play, but they take very different approaches to the same job.
WhatsApp Messenger, built by WhatsApp LLC, focuses on end-to-end encrypted chats, calls, communities and channels. Telegram from Telegram FZ-LLC instead leans into cloud-based messenger with massive groups, channels and bots. The two products are similar enough that comparing them feature-by-feature, rather than spec-by-spec, gives you a clearer answer.
This guide breaks down what each app does best, the use-cases each was designed for, a clean pros & cons matrix, and three high-intent FAQs people search before downloading. Both are free to install from the Play Store, so the real cost is your attention and habit — pick the one whose workflow matches yours.