This scripting language is also used to make the communication between a server side program and the user’s machine more efficient, as it reduces the amount of information transferred over the internet between the two programs. This is especially important for websites that serve large amounts of data, such as search engines or social media sites.
A good practice is to put the “must-have” jscripts in the head of the document and place “nice-to-have” scripts in the body of the page. You can also utilize a combination of both, placing the most important scripts at the beginning of the document and the “nice-to-have” scripts at the end. This will give the page a more consistent performance and speed.