Anewer kind of mobile site can do a lot of what only apps used to do, so the line has blurred between sites and apps. what are these sites called? certification

The answer is Progressive Web Apps (PWA).  It is a Web application that you can use to do everything, from analyzing portfolios and managing proposals, to entering time in a timesheet and updating task status. They are web applications that are regular web pages or websites, but they can appear to the user like traditional applications or native mobile applications. It attempts to combine features offered by most modern browsers with the benefits of a mobile experience.