Hypertext refers to the way in which Web pages (HTML documents) are linked together. Thus the link available on a webpage are called Hypertext. As its name suggests, HTML is a Markup Language which means you use HTML to simply “mark up” a text document with tags that tell a Web browser how to structure it to display.

All HTML elements can have attributes. Attributes provide additional information about an element. Attributes are always specified in the start tag. Attributes usually come in name/value pairs like: name=”value”

The HTML tables allow web authors to arrange data like text, images, links, other tables, etc. into rows and columns of cells. The HTML tables are created using the <table> tag in which the <tr> tag is used to create table rows and <td> tag is used to create data cells.

It is used to print a data in the webpage, Example: Car insurance , The following code print the text in the webpage.

If the file is not found by require(), it will cause a fatal error and halt the execution of the script. If the file is not found by include(), a warning will be issued, but execution will continue.

We can send 1024 bytes using GET method but POST method can transfer large amount of data and POST is the secure method than GET method .

Constructor is a special member function. It is invoked automatically when object of a class is created.

strlen() function used to find the length of a string.