This blog post, the second in a series on ownership in Mojo, expands on the mental model introduced in the first part by exploring how ownership is implemented in Mojo's compiler, crucial for effective memory management. Mojo ensures memory safety akin to Rust and efficiency comparable to C/C++ by enforcing strict ownership rules through different value types: RValue (owned), LValue (mutable reference), and BValue (immutable reference). It discusses how function argument conventions—borrowed, inout, and owned—manage memory safely and efficiently, with owned arguments taking an RValue on the caller side but becoming an LValue on the callee side, allowing the compiler to optimize memory management by converting unnecessary copy operations into move operations when possible. The blog highlights key rules for ownership handling and emphasizes Mojo's goals of memory safety, performance optimization, ease of use, and compile-time guarantees, providing a framework that enables developers to write efficient, safe, and high-performance code.