The big problem when you send files in a  printing house is the font. If you’ve used a family-face or typeface that your printing house doesn’t have, the result of the printing will print incorrectly.

This is why you’ll find that fonts within most vector logos (containing text) will have been converted to outlines, or paths.

This procedure means that the text will be no longer text – it has become a graphic, and so the text cannot be altered anymore.

So, how to convert text to outlines in Adobe Illustrator?

To convert text to outlines,

1. go to Select/Select All.
   It doesn’t really matter if other graphic elements are selected.
2. Go Type/Create Outlines.
   The text will become outlined and can’t be edited as text.

Now, all the text will be no longer editable and the line beneath the text has gone.

My suggest is to keep an editable copy of your document as an AI file before you convert text to outlines and save the file as an Illustrator EPS file. This is so that you can come back and edit it non-destructively later, instead of having to recreate the artwork with text again.

The text characters now have editable paths, or outlines, around them – they are no longer text, but vector graphics, and can be edited as such.

Information taken from a friend the site: http://www.graphic-design-employment.com/adobe-illustrator-how-to-convert.html