% Working With Uninitialized Memory All runtime-allocated memory in a Rust program begins its life as *uninitialized*. In this state the value of the memory is an indeterminate pile of bits that may or may not even reflect a valid state for the type that is supposed to inhabit that location of memory. Attempting to interpret this memory as a value of *any* type will cause Undefined Behavior. Do Not Do This. Rust provides mechanisms to work with uninitialized memory in checked (safe) and unchecked (unsafe) ways.