Will I have to keep checking Jotform to see if someone made a submisson?

Say I've created an application. If someone submitted one, how will I know they have done so? is there a way I can be emailed or notified when someone makes a submission?

It is not required to keep checking for your form submissions. By default, a notification will be added to your JotForm and when the form is submitted, the notification will be sent to the account registered email address. If you do not have the notification added to the form, you may add a new notification by following the guide below:

https://www.jotform.com/help/25-Setting-Up-Email-Notifications 

You may also send a Thank you message to the form submitting person by adding an auto-responder and if you have an email field on the form.

Hope this information helps!