A sticky post is mainly useful to highlight the important content on your blog. It lets you feature your best articles on your blog’s front page regardless of their publication date.
You can make any post sticky in your WordPress post editor.
You can also make the post sticky from "Quick Edit".
Sticky Posts widget allows you to show your posts which are set as sticky in a nice customizable layout.
Sticky Posts widget uses the features of Dynamic Posts, as such the documentation of some items will point to the common items.