WhatsApp Messenger includes features such as text messaging, voice and video calls, group chats, and media sharing of photos, videos, documents, and more. It employs end-to-end encryption for privacy and security. WhatsApp Web enables using the app on a computer by mirroring conversations and messages from your mobile device.

Yes, WhatsApp Messenger is free to download and use. It provides unlimited messaging and internet-based calling, requiring only an internet connection. Standard data charges may apply depending on your carrier or internet provider. There are no subscription fees or hidden costs.

WhatsApp Messenger is highly secure due to its end-to-end encryption, which ensures only you and your communication partner can read messages. This encryption is automatically active for all users. The app also offers two-step verification for added security and does not store your messages on its servers after delivery.

WhatsApp Messenger is primarily intended for use on a single device at a time. However, you can access your account on a computer via WhatsApp Web by scanning a QR code with your phone. Currently, using the same number on multiple smartphones is not supported, although multi-device support is gradually being introduced.

While robust, WhatsApp Messenger has some limitations: it requires an internet connection, does not support calling emergency services, lacks native features like secret chats or disappearing messages, and cannot transfer files larger than 100MB. It also cannot be used on tablets without a linked phone number.