ERP maintenance and upgrades are essential for optimal performance, stability, and security, with various types including version, release, platform, and customization upgrades. Regular maintenance offers benefits such as cost savings, business continuity, data quality, and user satisfaction, while supporting ERP functionalities can be achieved through add-ons, extensions, and APIs. Effective planning, execution, and change management are crucial for successful upgrades, as neglecting maintenance can lead to downtime, errors, and increased costs.