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    <p>load-time linking is when symbols in the library, referenced by the executable (or another library) are handled when the executable/library is loaded into memory, by the operating system.</p> <p>Run-time linking is when you use an API provided by the OS or through a library to load a DLL or DSO when you need it, and perform the symbol resolution then. </p> <p>I know more about Linux DSOs than Windows DLL's but the principle should be the same. .NET libraries may differ.</p> <p>In linux, plugin architectures are done this way. Your program will use runtime linking to load up a library and call some functions. Then maybe unload it. It also allows multiple libraries with the same symbols exported to be loaded without clashing. I think DLLs will work in much the same manner.</p> <p>Executables have "blank spaces" in their symbol tables that need filling by some library. These blank-spaces are usually filled in at load-time, or compile time. You can negate the need for "blank spaces" in the symbol table by using runtime linking. </p> <p>Another scenario where runtime linking is useful is for debugging libraries, or selecting from multiple, ABI/API compatible libraries at runtime. I often have a library, say "foo" and one called "foo_unstable" and have a test app that switches between the 2 and does some testing.</p> <p>Under linux, to see what libraries an executable links to at load-time you run the <code>ldd</code> command and get output such as (on /bin/ls):</p> <pre><code>linux-vdso.so.1 =&gt; (0x00007fff139ff000) librt.so.1 =&gt; /lib64/librt.so.1 (0x0000003c4f200000) libselinux.so.1 =&gt; /lib64/libselinux.so.1 (0x0000003c4fa00000) libcap.so.2 =&gt; /lib64/libcap.so.2 (0x0000003c53a00000) libacl.so.1 =&gt; /lib64/libacl.so.1 (0x0000003c58e0000 </code></pre> <p>The operating system will attempt to load the libraries (the .so files) at load-time. It may already have the library in memory.</p>
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