What are the differences between email or snail mail?

Email short for electronic mail, as we all know still uses an address and it doesn't physically cost you the money of a stamp to send a letter or pictures to someone, but it's not free. Snail mail could take a couple weeks to get across the country back in the day and now an email can go to 70 people in 40 countries instantly. In certain situations a handwritten letter is way more personal and still done by some people, but if I'm not mistaken I believe electronic Christmas cards, have even surpassed traditional ones. The information I found just says the eCards have hurt the greeting card industry they don't have exact numbers, because no real research has been done I'm assuming.
If we had invented computers and not come up with a system to communicate quicker than phoning everyone in a development teamm one person at a time, I couldn't imagine how hard it would have been to write a program or maintain a network. My first college degree in 1994 was in computer science. I learned programming when C++ was brand new and we converted the 386 PC lab to a 486 lab with ethernet cable replacing the coax cable for our Summer project. The largest group I worked on during a project was 5 and without email for communicating ideas after class hours I would've personally been divorced before I was married, because my girlfriend thought I was cheating on her just from the emails from a group member named Pepper.

What I Want Out of This Class

I originally signed up for this class just for the extra 3 credits, however now that class has started I find it really interesting how the internet has advanced and can't wait to see what else the class has to offer. My original degree was in computer science and instead of going into programming I chose networking and ever since then security and the lack of it on the internet and networks has always intrigued me. The idea behind Microsoft Cloud scares me no one should save so much information to the web and I can't believe that you can just right click on a web page and get their source code for the page.
The history of the computer is very interesting to me also just in the way that it has advanced over the decades and especially in the last few years. I personally think that we've only scratched the surface of the ability of computers and I'm really curious to see just how advanced we can make them. My family's first computer was a Tandy 1000 and I can remember playing just the simplest games on it and thinking how cool it was and now those games would be so boring in comparison. Advancements like driverless cars and virtual reality are on the horizon and when I got my degree in computer science in 1994 I'd have told you you were crazy that they were going to exist by now. I also hope to learn how to secure my own identity better especially with everything that's happened to me recently.