is tat escape sequences are used to display in new line instead of break tag

Answer 1

php output is normally a Web page = html.
if u print a new line, in html this results just as a space, not a new line.
to have a new line in result you have to print a break tag
echo "<br>";

Answer 2

\n will create a new line in the source code after loading the page, while <br> will print a new line to the screen so users can see that..