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Shared objects are Linux's mechanism for code reuse. Instead of every application bundling its own copy of common functionality (cryptography, image processing, compression), they link to shared .so files at runtime. The C standard library (libc.so), OpenSSL (libssl.so), and hundreds of other libraries live as .so files in `/usr/lib/` and `/usr/lib64/`.
The naming convention includes version numbers: `libexample.so.1.2.3` is the actual file, with symlinks `libexample.so.1` (SONAME, for binary compatibility) and `libexample.so` (for the linker during compilation). This versioning scheme allows multiple library versions to coexist on the same system — a solution to "dependency hell" that Windows DLLs never quite solved.
You don't "open" .so files — they're loaded automatically by applications that depend on them. The `ldd` command shows which shared libraries a program needs. Missing .so files produce the infamous "error while loading shared libraries" message. Install the missing library's package, or set `LD_LIBRARY_PATH` if it's in a non-standard location.