Why mentienence of a software is costly?

Maintenance of software is costly due to several factors, including the need for ongoing updates, bug fixes, and compatibility adjustments as technology evolves. Additionally, as software systems grow more complex, the effort required to understand and modify existing code increases, leading to higher labor costs. Furthermore, maintaining legacy systems often involves integrating newer technologies, which can be resource-intensive and require specialized skills. Lastly, the cost of ensuring security and compliance with regulations adds another layer of financial burden.