In HTML, why do we include a slash (/) in closing tags?

In HTML, the slash (/) in a tag indicates that it is the closing tag for an element. This is required because HTML uses pairs of tags to define where an element starts and ends.

For example,

<p>This is a paragraph.</p>

Here, <p> marks the start of the paragraph, and </p> marks the end. The content in between these tags—This is a paragraph.—is defined as a paragraph.

Without the closing </p> tag, HTML wouldn't know where the paragraph ends, which could cause formatting issues or incorrect rendering.

Hope this clears things up. Let me know if you have more questions.