A few months back, there was a rather interesting discussion on Reddit about different internet technologies. I put the following comment together as a bit of historical perspective. In retrospect, it’s probably not 100% accurate, and a bit or a rant, but I figured other people might find it interesting.
Your webserver back in the old days was probably NCSA HTTPd if your host hadn’t switched over to Apache. Apache is still one of the most popular webservers today. NCSA HTTPd, not so much. Apache is written in C, but you don’t need to know any C to configure it. Webservers generally deliver files, most often HTML which is just a marked up text file, but also images and videos and audio and pdfs and anything else you want.
A few years later and you also commonly see Nginx as a webserver and Microsoft’s IIS on Windows servers.
Programming on the web pretty much started with CGI scripts and was purely server-side. Back in the early nineties, this is how we did things – generally a C program that was compiled, and set to receive input from the webserver and do something with it – your form emailers and counters and guestbooks and so forth. You really don’t see much of this any more.
Most people switched over to Perl as an easy way to write scripts, rather than using compiled executables. Perl is notoriously hard to read and write, but a pretty good language for string processing (which is basically all the web is at the core). It has declined in popularity significantly over the last ten years or so.
Java began to show up more for web use towards the end of the nineties. These days, it’s synonymous with “Enterprise”, and generally used for large business applications. It’s a very dense language, and lots of frameworks exist for it, including ones like Spring, Hibernate, Struts, etc. Many, many other languages have grown up around Java, including Scala, Clojure, and Groovy.
PHP showed up about then as well, and quickly became the most widely-used language on the web. This was primarily due to its friendliness, ease of use, and ease of deployment – you could just drop scripts on a server the same as with html files and run them. Since PHP is so easy to use, lots of hobbyists have picked it up, and a large amount of awful code and poor tutorials have been written with PHP. Even so, the changes since version 5 have been increasingly bringing PHP towards the modern era, and it’s actually quite good these days. (Haters gonna hate.) There are many frameworks for PHP, including Symfony, CodeIgniter, Laravel, Cake, Zend, and others. Several of the most popular Content Management Systems (or CMS) are written in PHP, including Drupal, WordPress, and Joomla.
Ruby was gaining steam by the early 2000s. Based off of Smalltalk, it’s a very “smart” language that’s actually a lot of fun to write. It’s got a lot of niceties that do help you write code with less effort. The joke is that hipsters use Ruby, but it’s really a great language. It also has a fantastic package manager RubyGems / gem. Rails is the most popular framework for it; most other web frameworks often tend to just be clones of Rails. It’s a very opinionated framework, though – with lots of, what we call in the programming world, “magic”. Another popular framework is Sinatra, which is a thinner framework.
Python has technically been used on the web as long as PHP, but still doesn’t have very much marketshare. It is, however, used for not-web things frequently, especially among academics. In some schools, it has replaced Basicas the first language to teach children, due to its friendliness. The most popular framework is Django, though there is also Pyramid/Pylons and Flask.
ASP also needs a mention, though it is not an OpenSource language like the others, and owned by Microsoft. You often see it in conjunction with .Net, and it’s very popular for use in large corporations (pretty much anywhere you might otherwise see Java). It’s not very friendly, IMHO.
In the last few years, some older “purely functional” languages have come to popularity as well, including Haskelland Clojure (outgrowth of Lisp).
Now, you still needed somewhere to store all of your data, so the first popular databases came about. Most of these were ANSI SQL variants, and so behave almost identically, with the main differences being under the hood. These include:
MySQL : Still one of the most popular databases in use on the web. There’s a popular fork known as MariaDB as well, which gives you a few new tricks (like server clusters!).
PostgreSQL: probably the second most popular. (I’m guessing.)
MSSQL: the obligatory Microsoft version.
and SQLite which actually just operates on text files and is super lightweight.
And last, there’s Oracle which is a megalithic company all to itself, as well as a database, and a Business Intelligence service provider. Large organizations, colleges, and universities give them lots of money to make their systems go.
And then you have the no-SQL data stores that came to popularity in the last ten years or so, which generally are non-relational document stores. There are lots of these, but a few of note are:
Memcache was one of the first and most popular, especially since Facebook picked it up.
CouchDB another Apache project that uses JSON to store data.
Cassandra yet another Apache project, designed for high-availability of large amounts of data
Tokyo Cabinet and Kyoto Cabinet successors of dbm.