Some choose to use smaller video ports such as USB-C or faster and more capable DisplayPort ports. The reasons for laptop manufacturers to include other types of video ports differ. If you don't have HDMI on your laptop, you might have another type of video port on it.
How to connect an external monitor using other types of ports and cables (USB-C, DisplayPort, DVI, VGA, S-Video) HDMI ports are rectangular, with two right angles and two corners that are cut away. Look at your laptop to see if you do have an HDMI port on it. Many modern laptops have at least one HDMI port available on them, so there's a good chance yours has one too. It's one of the best ways to do it, as HDMI provides an excellent balance between performance, video quality, and ease of use. If you have a laptop with an HDMI port, you can use it to connect an external monitor and even TVs or video projectors. HDMI, which comes from High-Definition Multimedia Interface, is a technology that allows electronic devices to transport both video and audio streams to compatible computer monitors, TVs, video projectors, and other similar devices, using dedicated cables.
How to connect a second monitor to a laptop using HDMI