It is a marketing strategy that relies on sending regular email newsletters to a list of subscribers. These messages aim to provide valuable information and updates about goods and services, in addition to building long-term relationships with customers.

Characteristics:
1. Regular communication: Newsletters are sent regularly, whether weekly or monthly.
2. Diverse content: Includes information about products, offers, news, and educational content.
3. Subscriber list: Based on a mailing list of subscribers who prefer to receive updates.
4. Customizability: Content can be customized based on subscribers' interests.

Benefits:
1. Building relationships: Strengthens the relationship between the brand and customers through continuous communication.
2. Increasing awareness: Helps keep customers informed of the latest news and offers.
3. Stimulating sales: It can be used to promote new offers and products.
4. Performance analysis: Provides analytics on opening messages and clicks to evaluate the effectiveness of campaigns.

Features:
1. Low cost: It is considered a low-cost marketing method compared to paid advertising.
2. Content Personalization: Messages can be personalized based on subscribers’ preferences and interests.

3. Customer Engagement: Increases engagement and interest by providing valuable content.

4. Measurability: The performance of newsletters can be measured through open and click-through rates.

Cons:
1. Reachability: Posts may end up in the spam folder or be ignored.

2. Repetition: Some subscribers may get bored with repetitive messages.

3. List Update: It requires constant updating of the subscriber list to maintain its effectiveness.

4. Engaging Content: It requires designing engaging and useful content to maintain subscribers’ interest.

Examples of Companies:
- Arab Companies:
- “Arabi Post” Magazine: Uses newsletters to keep readers informed of the latest news and articles.
- “Jarir Bookstore” Company: Sends newsletters about the latest books and special offers.

- Foreign Companies:
- The New York Times: Relies on newsletters to provide readers with the latest news and analysis.

- Shopify: Sends newsletters with business tips and special offers for e-commerce store owners.

Newsletter marketing is an effective way to communicate with customers by sending regular information and updates via email. It offers great benefits in building customer relationships and increasing brand awareness, but it requires careful management to ensure that you provide engaging content and update your subscriber list regularly.