To ease understanding of HTML, elements are grouped in certain categories. These elements can only exist within the HEAD element.
P is an example of a block element.
Block elements define a block of text or information. A , the anchor element, is an example of an inline element. Inline elements usually make sense even when they contain only part of a sentence or phrase. Inline elements are always contained within block elements. We have already seen that paragraphs cannot contain other paragraphs.