## 3 Content Management Systems (CMSs) in e-Government  
Content Management Systems (CMSs) have evolved and are important tools for e-Government, allowing governments to create, manage and maintain web portals that provide services to citizens and businesses [27]. With the ever-increasing importance of the internet, government organizations cannot simply have a website, but must ensure that it is functional, secure, accessible and adaptable to the needs of users. A CMS offers a platform for easy content management without the need for advanced technical knowledge, allowing public authorities to quickly update information, ensure transparency and meet citizens' expectations for modern and easy-to-use digital services. Choosing the right CMS is recommended for the sustainability and success of government online platforms [27]. Moreover, there is a set of desirable characteristics in the choice of a CMS. Within the ones mentioned, the most relevant are:  
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* Speed and accuracy in publishing content;
* Functions for collaborative work;
* Single access point;
* Customizable access via user type;
* Security. An effective CMS should support multiple languages, have high-level security techniques, be flexible in presenting information and allow for the integration of new features through extensions or plugins. In addition, its architecture should allow the development of a single framework for different government portals, allowing adaptation to each entity without requiring the creation of separate solutions for each case. In addition, it should ensure interoperability between different government services and integrate APIs that allow automatic data exchange, reducing bureaucratic burden and improving the efficiency of digital services. The choice of WordPress as the main platform for government websites is based on its scalability, large support community, ease of use and high security. Although initially created as a tool for managing blogs, it has evolved into one of the most flexible and powerful CMSs, used by governments and organizations worldwide. WordPress offers a dynamic architecture based on events and filters, allowing it to be customizable through plugins and themes, without requiring any modification of the system's core code. This feature is particularly important for e-Government, as it allows for the gradual expansion of services without the risk of incompatibility or data loss. The integration of APIs into the CMSs of government websites allows for seamless connections with other digital services, offering increased interoperability and automation of processes. Through APIs, different government platforms can communicate with each other, ensuring the flow of data without the need for any human intervention. A typical example of API application in government services is the Greek myDATA service of the Public Revenue Authority, which allows businesses to digitally transmit their accounting data to the tax office. This process not only reduces bureaucracy but also enhances transparency and compliance with tax laws. Implementing a CMS for government services requires the use of advanced web development technologies, such as HTML5, CSS3, JavaScript, PHP and MySQL, combined with cloud-based infrastructures for increased security and scalability. The implementation allows the unification of different services under a single system, improving user experience and reducing the development and maintenance costs. In addition, the use of modular architecture and security management mechanisms ensures the stability and long-term viability of the solution. CMSs play a crucial role in the success of e-Government, enabling governments to deliver modern, user-friendly and secured digital services to citizens. Choosing an open source platform, such as WordPress, offers customization and extensibility, ensuring that the system can continuously evolve with technological trends.