web directory
A directory is a series of cetegorized links. Links in a directory will be organised in a hierachial system eg uk>wales>county in wales>business to bussines and so on. A directory can either have a quick blurb and a hypertext link, or a link to a page specifically about that site together with links to the site.
search engine
A search engine has no structure, all sites and information is held in a database and the sites are served up as a result of a search, with no other way of reaching the sites A directory with a search facility is still a directory and not a search engine).
meta search engine
A meta search engine (MSE) holds no data itself, it aggregates the SERP's on the fly from the other search engines Coppernic is a prime example of this technology. You make a search on a MSE which then gathers the data, and applies its own algorithm to the returned data to provide you with a hybrid SERP.
link farm
Link fams are traditionally pages where you add your site to the list, and host the page on your server. Newer versions of this do it by using a script that delivers the content to your page. This is why it is called a link farm, as you 'plant' your link, and it grows as the page populates the web. Ths the traditional links farm. Any directory that appears identically across a number of sites, which when someone adds their link to it, it appears everywhoere.
FFA (Free For All) pages
These are a set of links that you just add your site to, and backink to it. They are very similar to link farms. The problem you get with many 'flaky directories' are that they are hybrids of link farms, FFA's and directories. Keep in mind that you WILL eventually get penalized for linking to bad neighbourhoods. It might take some time for the clustering algo to tie you into the cluster, but when it does, you can look forward to having your site removed completely from the index.
Hope this explains what I consider each to be.
OWG



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