It is called a Drop Down Tree.
Windows is a popular operating system, but it is made by Microsoft, not Apple.
Windows XP was the most popular operating system.
Microsoft Windows
xp
Windows 7
why is windows xp more popular than other operating system
Windows 7.
system
Do you mean Windows? It's the most popular and compatible operating system available from Microsoft.
windows
Some popular IT admin jobs include: IT System Applications Administer, Windows System Administer, Network Administer and Equity Trade Support Administer.
Mac-OS=Disk operating system==Linux OS==Windows OS==Unix OS=