Summarization: The objective of this Master’s Thesis is to understand the modern CRM (Customer Relationship Management) system and explore the landscape of the CRM systems in the Greek Market. CRM systems are valuable tools for every company, Small, Medium, or Large. They provide their corporate members with appropriate information so that they can make the most profitable decision for the development and operation of the company. The present research aspires to document the Greek companies that engage in the development and sales of the CRM systems, the individual features of the CRM systems, for example, the use of cloud technology, the business model of each company, etc. In this thesis, we frame the importance and operation of CRM syste...