Memory management in Rust is handled through the use of lifetimes. A lifetime is a scope in which a reference is valid. It is used to ensure that references remain valid for the lifetime and that the memory is released when the lifetime ends. 

For example, when a variable is declared, it is given a lifetime. If a reference to that variable is used in another scope, the lifetime of the reference must be equal to or shorter than the lifetime of the original variable. If not, the compiler will throw an error. 

Lifetimes also help ensure that memory is released when it is no longer needed. When a variable goes out of scope, the memory associated with that variable is released and can be reused. This helps prevent memory leaks and ensures that the memory is used efficiently.
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