Penfriends, also known as pen pals, correspondents, or letter friends, are individuals who exchange letters with each other. These individuals may be from different countries, backgrounds, cultures and ages. Penfriends often share their views, interests and experiences through written letters. The term "epistolary friend" can also be used to refer to a penfriend. Online platforms and social media networks have replaced traditional letter writing, and have led to the rise of "e-friends" or "virtual penfriends". Regardless of the term used, penfriends provide an opportunity for individuals to form friendships and learn about different cultures and lifestyles around the world.