Both digital marketing and SEO are considered to be processes through which the reach of a particular website and/or products and services can be increased. In other words, both of them are too used to be able to reach more customers for a website or product or service.
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References
- https://www.deslegte.be/files/samples/books/9789462762022.pdf
- https://hal.inria.fr/hal-01449453/document