Kindly tell me what is the difference between short tail keywords and long tail keywords. Which one is more beneficial for a website.

Short tail - 'Keyword'
Long Tail - 'This is your keyword'

Short is a just one or two word.. Long is around 4-5 words. Always choose the latter.

Using Long Tail Keywords can be highly beneficial for you for its targets the exact or specific keyword.There will be less competition. Short tail keywords means it have lovely competitions to reach front page to google not that much simple and even for hard keywords it will take ages to reach front page.

short tail is short keywords while long tail is long keywords, short tail keywords are mainly very competitive and long tail keywords are less competitive.

Long tail keywords – will bring in less traffic to your site, but the traffic it does bring is very directed and your chances for a sale, rental etc is relatively high.

Short tail keywords – more general keyword phrases that have a large amount of traffic, but due to its’ undirected nature, conversions, sales, etc are low.

Short tail keyword are short in length, usually it's made from max 2-3 words like "Computer Mouse" while long tail keyword is like a sentence =>"Where can i find computer mouse?".