meaning

Question

<br\>

Answer 1

The tag <br> is used to break the line, aka new line.
Little notation: in HTML it's used <br>, while in XHTML you type <br />.

Answer 2

<br/> this code sends data to next line
for example:
>>hello world! welcome to my world
output : hello world! welcome to my world

>>hello world! <br/>welcome to my world
output : hello world!
welcome to my world