Explore the concept of undefined behavior in C++ through this comprehensive conference talk from CppNow 2014. Delve into what undefined behavior is, why it matters, and its implications for C++ programmers. Learn about various examples of undefined behavior, including array access violations, signed integer overflow, and uninitialized variables. Examine compiler optimizations, performance considerations, and language semantics related to undefined behavior. Discover the history behind undefined behavior in C++ and its impact on modern programming practices. Gain insights into detecting and avoiding undefined behavior to write more robust and reliable C++ code.