Date Created - it marks when the file was created for first time
Date Modified - it marks when anything was written in the file
Date Accessed - it marks when the file was accessed for reading, execution, etc.
About Windows File Dates
If you don't know "touch" is a popular UNIX utility for changing file dates.
Unfortunately Microsoft does not provide a corresponding utility in Windows,
so one should use utility like File Date Touch when one needs to change file dates
in Windows manually. There are couple of similar popular utilities out there
which can do the job. You can use this one however if you want to avoid any
download registrations, installation procedures or .NET requirements.
Most people don't know that each Windows file has 3 date and time stamps:
Windows Explorer shows by default only the Date Modified because one normally cares
only when the content of the file was changed last time. If you want to see the
other dates from Windows Explorer you can go to "View" - "Choose Details" and
check the other two dates.
File Date Touch changes the Date Modified and sets the Date Accessed equal to
Date Modified always automatically. It gives you the option to choose if you want
to change or not the Date Created.