SMS marketing and WhatsApp marketing are forms of mobile marketing that involve sending promotional messages, such as text messages or WhatsApp messages, directly to a customer's mobile phone.

SMS marketing, also known as text message marketing, is the practice of sending text messages to a group of people who have opted in to receive them. These messages can include promotions, discounts, updates, or other information that is relevant to the recipient.

WhatsApp marketing is the practice of using WhatsApp Business API, a WhatsApp-approved platform, to send and receive messages with customers, such as automated greetings, notifications and quick replies, sending promotional messages and providing customer support.

Both SMS and WhatsApp marketing are highly targeted and personal, as the messages are delivered directly to the customer's mobile phone, and can be very effective in driving conversions and building customer relationships. Some best practices for SMS and WhatsApp marketing include:

• Obtaining explicit consent from customers before sending messages
• Personalizing messages with the customer's name or other relevant information
• Being mindful of the frequency and timing of messages
• Providing an easy opt-out option for customers who no longer wish to receive messages
• Measuring and analyzing the performance of campaigns through metrics such as open rates and click-through rates.

SMS and WhatsApp marketing are powerful ways to reach a highly targeted audience, but it's important to be mindful of the legal requirements, such as the opt-in and opt-out process, to avoid any unwanted messages and potential legal issues.