给你一段文本如下：In the era of digitalization, businesses are more dependent on online marketing to boost their sales. Digital marketing is a broad term that encompasses various techniques to promote businesses online. One such technique is email marketing. It is an effective way to reach out to a large number of people at once. One of the reasons why email marketing is popular is that it is cost-effective. Moreover, it allows businesses to target their specific audience based on their interests and preferences. With email marketing, businesses can create personalized messages to establish a deeper connection with their customers. However, it is crucial to avoid spamming customers with irrelevant emails. To make the most of email marketing, businesses should focus on providing value to their customers by offering them valuable information, discounts or promotions. ，总结其中的关键词。
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