Pen pals are people who write to each other via postal mails.
I have got two pen pals and I love sending emails to them (not letters in traditional way, though I like the feel of paper and pen). Whenever I get a mail from them, I get excited. We talk about anything and everything on this earth - Which books we have read or are reading, which movies to watch, what we felt listening to that song or hearing that poetry. I don't have to think before writing anything to them. We agree or disagree to whatever the other person is saying.
For those who know me, I cannot talk much on phone. I could talk on and on if you are in front of me, otherwise I could write.
I feel that conversations over phone, messenger, whatsapp, Instagram are limited to one liners and many a times too formal. More the mediums we have , lesser we are talking these days. And by talking I meant talking substance.
Also I cannot talk in groups. And by group I meant more than two people. In groups I am mostly listening.
Having pen pals is amazing. Get a pen pal, share your feelings, write. You could be your own pen pal also by writing diary entry.