Hello.
I'd like to introduce what Illustrator actually is and what it does.

"Adobe Illustrator is the industry-standard, powerful graphics application that can be used for a wide range of purposes, including print, web, mobile and video."

*From the Adobe website

Illustrator is indispensable for production and design work.

As noted above, Illustrator can be used for a wide range of purposes, and it offers advanced drawing and expression tools.

So, specifically, why is that?

1. Not bound by resolution

Data drawn in Illustrator is vector graphics, so it maintains its precision whether enlarged or reduced. With data such as photos, enlarging them can make the image quality rough, but with vectors there's no such worry.

"It flexibly handles everything from low-resolution images such as web icons and mobile content to high-resolution graphics for print, and can export to a variety of file formats including JPEG, GIF, SWF, PDF and SVG."

*From the Adobe website

2. A wide range of expression tools

You can use brushes to create a hand-drawn texture, or produce the fine precision of something drawn by machine.

You can draw curves freely, and along with shapes there are of course various support tools,

so as you get used to the software, the range of what you can express keeps expanding.

3. An abundance of tools to help with color schemes

Color-scheme support features such as the Color Guide and Live Color are well developed, displaying a variety of colors—similar but slightly different shades, shadow colors, complementary combinations and more—based on the color you select. You can even apply changes provisionally and see them reflected all at once without rewriting the actual data.

④ Flexible text control

You can control text in finer detail, adjusting line spacing, character width, alignment and more.

Long passages of text and titles edited in Illustrator really do look noticeably better.

By outlining text, you can use it regardless of whether the font is installed, which is also handy when you ask a printing company to handle your printing.

That was a rough introduction to what kind of software Illustrator is.

Next time, I'd like to introduce Photoshop.