Here vs herein

there is no difference between them , but herein is more informal than here .

Thanks for your response Hamed.

But I think, it it the other way round. Herein is more formal than here.

I wonder if it is the only difference between them.

Cheers

Look at the following link from Longman dictionary;

http://www.ldoceonline.com/dictionary/herein

As it is stated, herein is a formal word.

Regards

If you are writing a lengthy formal document, you might write something like the following in the heading or abstract.

"During my research I have discovered numerous advances which are presented herein."

This indicates that your document does contain the information, just not right in that partucular section.

If you write "... which are presented here." Then you need to

The one situation where "herein" is somewhat common in spoken english is when describing a situation that should contain all the clues to an answer, but the exact answer isn't clear.

For example,

Herein lies the problem. Followed by a lengthy discussion about the circumstances of the event or events surrounding the the subject which allude the solution when taken as a whole.

Herein is defined as "in this place."

Here is defined as "in, at, or to this place"