<aside>

is secondary or tangential content which could be considered separate from but indirectly related to the main content. This type of content is often represented in sidebars. When an

<aside>

tag is used within an

<article>

tag, the content of the

<aside>

should be specifically related to that article

<article>
    <h1> Gifts for everyone</h1>
    <p>This website will be the best place for choosing gifts</p>
    <aside>
        <p>Gifts will be delivered to you within 24 hours</p>
    </aside>
</article>