Hi Sonmv13194,
Talking particularly about Find element, it stops running of the workflow until special condition is met.
Imagine, you are using UiPath for an automation assignment wherein you open a URL in a browser, enter some data in it and there is a textbox, OnSetFocus of which Datepicker loads. You might have to wait for Datepicker to appear on the screen (may be for couple of seconds or so). So in such case, you can try using “Find element” till Datepicker loads (it will get the cursor in textbox and then wait for DatePicker to load).
Hope you find the explanation useful.
Regards,
Umesh