SPD 2010 introduced (no code required) that support:
: Users could build automated workflows for tasks like IT service ticket management, document approvals, and task assignments without writing code. microsoft sharepoint designer 2010
Microsoft SharePoint Designer 2010 (SPD 2010) is a specialized web and application development tool used to build and customize SharePoint websites and applications without writing code. Released as part of the SharePoint 2010 ecosystem, it remains a notable tool for legacy environments, offering deep integration for site management, workflow creation, and data connectivity. SPD 2010 introduced (no code required) that support:
As SharePoint moved toward the cloud (Office 365) and eventually modern experiences, Microsoft realized that allowing users to inject custom code and scripts directly into the master page was a security risk. They moved toward "sandboxed solutions" and eventually the add-in model. As SharePoint moved toward the cloud (Office 365)