HTML tags decided how HTML file is look like on web page.I have given you some basic information about HTML tags.
1.In HTML,every keyword should be surrounded with open and closed with angled brackets.
2.HTML tags are not case sensitive means that suppose if we open <html> tags than we can closed this tag with <html>.
3.When we open an HTML tag it should we have to closed tag.Like: <a>....</a>
4.In the above point tag (<a>) is called the open tag.where as tag</a> is called the end tag.