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Fonts must either be on a reader's computer or linked from another source to display correctly in a browser. Fonts that we can expect to be on most computers so they display correctly are called web-safe fonts. There are a handful of web-safe fonts. If you stick with these fonts, you can expect them to load correctly in the browser, because most computers have them installed. They are Times New Roman, Georgia, Courier, Trebuchet MS, Arial, Comic Sans, Verdana, and Impact.

Of these, three are more legible(Verdana, Georgia, Trebuchet MS) than the others, due to X-height and space in and around the letterforms. So, web-safe fonts can feel a little constricting. Personally, I love the creative freedom of linking fonts into my web pages. Linking web fonts can add variety of forms and can also add a layer of meaning into the design.
But linking in web fonts from another source can create problems, most will cost you money, which may or may not be an option for your client or if you're a student.Those that are free tend to have quality issues. Either the system of letters is inconsistent, the spacing between letters is wonky, or the font doesn't include a bold or italic style to go with it.

Finally, linking to web fonts can slow down your web pages. Sometimes the time is not noticeable, but if you're working with a lot of text and a lot of web fonts, the time it takes for the fonts to load is very noticeable, So web-safe fonts, those eight fonts that are extremely likely to be on most computers, are the work horses of web topography. They are free, quality tested, and don't have to download, so they do not affect your page loading time.