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    <p>Looking at SOA as a set of this or that technologies is wrong. I also don't agree that SOA is just a marketing term, though it did get bad reputation and was muddled down by marketing and hype.</p> <p>Service Oriented architecture is an architectural style. as in a blueprint for an architecture that possets constraints on how and what services should be asa well as define a set components and defines their interactions. The diagram below shows SOA vs. REST and you can see that they are derived from some common styles (e.g. they both build on client/server) but also arrive from different styles where SOA builds on <a href="http://www.cs.olemiss.edu/~hcc/csci581oo/notes/pipes.html" rel="nofollow noreferrer">pipe and filters </a> and REST does't (you can build RESTful SOAs but you have to work harder :)) <img src="https://i.stack.imgur.com/3SXcY.png" alt="enter image description here"></p> <p>SOA puts a lot of emphasis on the interface. So unlike OO, for example, you have 4 different components that define an interface. The messages, the contract which bundles messages, endpoints where the contracts are delivered and policies that govern how/when contracts are deliverd.</p> <p><img src="https://i.stack.imgur.com/GBuLL.png" alt="enter image description here"></p> <p>Building services with well defined boundaries &amp; good granularity (that's the tricky part) lets you compose services in a flexible way that lets you implement business capabilities faster. Pardon me for banging my own drum but you can read more on what's SOAand REST vs. SOA in <a href="http://www.manning.com/rotem/SOAp_SampleCh01.pdf" rel="nofollow noreferrer">chapter 1</a> and <a href="http://www.manning.com/rotem/SOAp_SampleCh10.pdf" rel="nofollow noreferrer">chapter 10</a> of my book on SOA patterns </p>
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    1. POUnderstanding SOA architecture
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    1. USArnon Rotem-Gal-Oz
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    1. COYeah, I suppose simplifying SOA down to marketing hype is unfair, rather I should have said this simple concept has been rendered over-complicated by the SOA vendors who produce and promote their many technologies & tools as being the only pathway to achieving SOA. I really like your second diagram here, because it is more specific to what defines SOA and a picture tells 1000 words. For the first diagram though, I think it could be argued that you can draw arrows from "Distributed Agents" and "Pipes and Filters" to REST as well, albeit as you said, it requires more work to get there.
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    2. COThe four architecture styles that derive REST weren't defined by me- they- that's how REST is defined by Roy Fielding see his dissertation http://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm
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