SMS gateway is a service enabling businesses to send and receive SMS messages seamlessly through APIs or software platforms. It connects applications to telecom networks, ensuring efficient communication for marketing, alerts, or transactional purposes. Widely used for OTPs, reminders, and promotional campaigns, it supports high-volume messaging with reliability and speed. SMS gateways offer features like global reach, delivery tracking, and customization options, making them ideal for enhancing customer engagement and automating notifications effectively across industries.