excerpt (fragment, snippet) (tag)

get_extended()	Divides content into 2 parts: before `<!--more-->` and after it. Returns an array with the resulting parts.
get_the_excerpt()	Retrieves the excerpt of current or defined post. By default, should be used in WordPress Loop.
has_excerpt()	Checks if the current post has an excerpt (quote, short description). Conditional tag.
the_excerpt()	Displays the excerpt (quote) of the post, with `[...]` at the end (but this is not a link to reading the full material).
wp_trim_excerpt()	Creates a quote from the content of the post when the quote (excerpt) is not specified. Used inside the WordPress Loop.