Class VS ID

Class

This can be applied to multiple elements and can also be used for styling. There's multiple elements that can share the same class. When using class; it is written as class="example"
In CSS, class is written as .example
Class is commonly used for styling groups of elements. This attribute is used to determine one or more class names for an HTML element.

ID

It is primarily used for styling and can exclusively identify a single element. When using ID; it is written as id="example"
In CSS, ID is written as #example
Only one element can have a specific ID.