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Workflow automation
Workflow automation is a terminology that is used in the businesses that touches on the design, execution, and automation of workflow processing rules. In workflow automation, human tasks, data or files are routed between people or systems based on pre-defined business rules.
Web application
A web application is essentially an app that you would find on your phone or desktop, just on the web instead. Google Docs or Gmail are examples of web applications.
Website
A website is essentially a collection of static pages and text that the company or individual interlinks in some meaningful way.