The Child Selector is used to find all items that are children of a given element. It establishes a link between two elements. The element > element selection chooses elements that are offspring of a particular parent.
Only HTML Elements that are direct offspring of a specified element are selected by the Child Combinator (>). The Descendant Combinator, on the other hand, chooses all HTML Elements that are children, grandkids, great-grandchildren, and so on. They're all descendants of a single element, hence they're all chosen.
All elements that are a direct child of the specified element are selected using the ("parent > child") selection.
In CSS, there is currently no mechanism to pick an element's parent. It would be in any of the current CSS selectors specs if there was a way to accomplish it: Level 3 Selectors Spec.
You can use the:first-child selection to target the first element that appears inside another element. It is defined as a "structural pseudo-class" in the CSS Selectors Level 3 spec, which means it is used to style content depending on its relationship with parent and sibling content.