i don't understand the "vendor directory" feature

<p>please explain the vendor directory feature which was mentioned here <a href="http://blog.golang.org/go1.6" rel="nofollow">http://blog.golang.org/go1.6</a> at the forth block<br/> what is it? what is it used for?</p> <hr/>**评论：**<br/><br/>rvxt: <pre><p>read this <a href="https://golang.org/s/go15vendor" rel="nofollow">https://golang.org/s/go15vendor</a></p> <blockquote> <p>If there is a source directory d/vendor, then, when compiling a source file within the subtree rooted at d, import &#34;p&#34; is interpreted as import &#34;d/vendor/p&#34; if that path names a directory containing at least one file with a name ending in “.go”.</p> <p>When there are multiple possible resolutions, the most specific (longest) path wins.</p> <p>The short form must always be used: no import path can contain “/vendor/” explicitly.</p> <p>Import comments are ignored in vendored packages.</p> </blockquote></pre>_cowl: <pre><p>Vendoring is using a local package (lib) instead of the online one when importing. This is mainly done to use a specific version instead of the latest one and especially to use a locally modified/patched version. </p></pre>kardianos: <pre><p>This might be useful: <a href="https://blog.gopheracademy.com/advent-2015/vendor-folder/" rel="nofollow">https://blog.gopheracademy.com/advent-2015/vendor-folder/</a></p></pre>