why i have to use <nav> element ?

Question

i have the same result for the example in the slide without put <nav> element!...so why i have to type <nav> element?

Answer 1

<nav> is a HTML5 tag which defines a block of links. All links should not be inside <nav> tag except the major blocks which helps readers to access the site easily. :)

Answer 2

in HTML you don't need to use anything, <NAV> is an indication that the writer will be summing of a group of links.