The definition of a graphic designer is someone who uses and brings together images to create a design in the graphic arts industry. If the designer works for a graphic design agency they will use the media, whether printed or electronic in order to make the illustration or web design.
The role of a designer is a difficult one; they have to constantly come up with new ideas in a highly competitive arena. You can get more information about graphic design agencies at https://www.aronsonhecht.com/.
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No one can be a graphic designer; there are certain qualifications that you will need if this is the career path you want to follow. You will need some kind of industry experience before the agency hired you so you may have to do some volunteer work to build your portfolio.
It is very common for a design agency to ask to see your portfolio so that they can gain an understanding of the type of work you do. Graphic design is an art and you will find that it is a highly skilled branch of creativity.
Photoshop is a computer program that is most commonly used among designers. It allows you, as a designer, to manipulate images and play around with them in order to get the best results.