The major difference between Windows 7 and Windows 10 is that Windows 10 was developed with an attempt to synchronize the OS on all its products. It includes PCs, laptops, tablets, phones, as well as its X-boxes.
Windows 10 is optimized for touchscreen and whereas Windows 7 is not.
Windows 7 is only supported on PCs and laptops.
While Windows 7 came with Internet Explorer 8 built in, Windows 10 has got directly upgraded to Windows Edge which is more streamlined and faster than Internet Explorer 8.