What is a Thematic Break? In Html 5

Answer 1

What does it do?

Answer 2

Thnx

Answer 3

i have the same question as @Manohar Yekkala
i know the Thematic break means break the related paragraph from each-other but i just want to know that: should i use a <hr/> for each separation in order to get higher rank in search engine ? i mean is this important for example put a </hr>
between each post is useful and meaningful ? we assume that we hide the <hr/> with css and we just put it for its functionality. Thanks In Advance.