As the title says, what does it mean?
I was looking for a "domain driven design" books but there is a book called, "Domain-Driven Design Distilled".
Does it mean it's abridged? What does "Distilled" mean in the context of book title?
The second definition of distill is extract the essential meaning or most important aspects of. definition
So that book is probably about the essential meaning or important aspects of 'Domain-Driven Design'.
It is a figurative concept of the chemical process of distillation. The Oxford English Dictionary explains it as sense 4e of the verb to distil.
e. fig. To extract the quintessence of; to concentrate, purify.
1599 E. Sandys Europæ Speculum (1632) 142 This man is very charie over that one remaining, and distilleth all other devises rather than set finger to that string.
1600 W. Cornwallis Ess. I. xii. sig. G6v, Time hath distild our bloods.
1873 H. Spencer Study Sociol. x. 267 Men who are distilled into the House of Commons, and then redistilled into the Ministry.
1889 Spectator 14 Dec. 830 We want a removable Secretary for school works, not a committee, which is only the public meeting over again, a little distilled.
In terms of its use in a book title, it would suggest that a topic had been abridged and concentrated down into a more concise form than otherwise.
The meaning of "distill" in this sentence is the same as the literal definition:
purify (a liquid) by vaporizing it, then condensing it by cooling the vapor, and collecting the resulting liquid.
just used metaphorically. In the same way you can extract the desired alcohol from a solution of fermented material, with this book, the author claims to have extracted the most useful information about "Domain-Driven Design".