Class And Id

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HTML Class Attribute:

The Class attribute is used to specify a class for html element.
Multiple HTML elements can share the same class.
Syntax Of Class:To create a class, start with a period (.) followed by the class name. Then, define the CSS properties inside curly braces {}.
This is example of class:

#class_name{
background-color:red;
color:white;
}

 <h1 class="class_name">This the example of class attribute</h1>

HTML Id Attribute:

The id attribute gives a unique identifier to an HTML element. The id value must be unique within the HTML document.
To use an id, start with a hash character (#) followed by the id name. Then, define the CSS properties inside curly braces {}.
The id name is case sensitive.

#id_name{
background-color:red;
color:white;
}

<h1 class="id_name">This the example of class attribute</h1>