It is just the word at the bottom of the page. Means there are additional letters or documents "enclosed". Lets the recipient know to look for other stuff with the letter.
It means you have included a cover letter with your application or CV or resume
It happens to be generally believed that the cv has provided the opportunity for interviews. Nonetheless, it is a fact the jop application cover letter generally helps make the individuals offering the place of employment make up their mind. A properly created employment cover letter will improve your current possibilities for any employment interview.