Font families can be divided into two groups: serif and san serif. A san serif font does not include the small lines at the end of characters, while a serif font does include these small lines. When choosing which kind you prefer, remember that studies have shown that sans serif fonts are much easier to read on a computer monitor as opposed to a serif font.
body {
font-family: courier, serif
}
p {
font-family: arial, "lucida console", sans-serif
}