Legal discovery means that, when a lawsuit happens, both sides ask for (and receive) huge volumes of documents from the other party. Producing those huge volumes of documents can be quite challenging.

For example, someone in litigation with Google might hit Google with a discovery request saying "We want all documents, memos, and emails pertaining to search spam." That is, conservatively, millions of documents. So Google has to grab every email a Googler has ever written, then winnow that set down to just the relevant ones, then have lawyers pick through and exclude the ones protected by privilege, then get those hundreds of thousands of pages in a lawyer-accessible format delivered to the opposing party within a very tight timeframe.

This is challenging on Big Freaking Enterprise scales. Logik does the painful bits of it for you. They presumably charge Big Freaking Enterprise prices for it.