Graphic Design is an art where experts create visuals for social media and other platforms to communicate messages. The graphic designers create attractive and informative content in the form of visuals to communicate with the viewers. There are many softwares used by the graphic designers for creating content:

Adobe photoshop
Corel PaintShop Photo Pro X3
Adobe illustrator
Adobe Flash
Adobe Indesign
Corel Paint
Xara Designer Pro
Wacom tablets

These are the famous softwares used by the graphic designers for creating different types of visuals to connect to the viewers.
Many companies that provides graphic designing services for their clients hire graphic designers for fulfill the requirements of them.