Bulk WhatsApp SMS service refers to sending mass messages via WhatsApp to a large number of users simultaneously. This service is widely used for marketing, promotions, alerts, or customer engagement. Unlike traditional bulk SMS, it leverages the WhatsApp platform to deliver messages, making it more interactive and versatile, since WhatsApp supports text, images, videos, documents, and even voice messages.

Here are key features and benefits:

1. Rich Media Support: WhatsApp allows multimedia, including images, videos, audio, and links, which enhances communication beyond simple text.
2. Higher Engagement Rates: WhatsApp messages often have higher open and response rates compared to traditional SMS, as the app is more popular for daily communication.
3. Global Reach: WhatsApp is widely used around the world, making it an ideal platform for international communication.
4. Two-Way Communication: Unlike SMS, which is usually one-way, WhatsApp enables real-time two-way conversations, helping with customer support, feedback, and queries.
5. Encryption and Privacy: Messages on WhatsApp are end-to-end encrypted, ensuring security and privacy.
6. Broadcast Lists: WhatsApp allows the creation of broadcast lists where messages are sent individually to each recipient without forming a group.

To send bulk messages on WhatsApp, companies usually need to use WhatsApp Business API, which requires approval from WhatsApp and is often managed via third-party platforms. This API ensures that businesses are using WhatsApp responsibly, following privacy and anti-spam guidelines.