The correct HTML tag for inserting a line break is the term br encased inside of brackets. This tag will insert a single line break, and is supported by the most common browsers, including Internet Explorer, Firefox, Google Chrome, Opera and Safari.
The br tag should not be used to separate paragraphs. Instead, the paragraph HTML tag should be used, which is simply the lower-case letter p encased in brackets as well. For inserting a br tag in HTML, br followed by a space and then by a forward slash will be used inside of brackets. There is no difference in the line break tag when working with HTML 4.01 or HTML 5.