What is the lowest level of programming language consisting of only 1's and 0's?

The lowest level of programming language consisting solely of 1's and 0's is referred to as machine code. Machine code is directly executed by a computer's central processing unit (CPU) and is the most fundamental way of representing instructions in a form that the hardware can understand. Each instruction in machine code corresponds to a specific operation that the CPU can perform, such as arithmetic operations, data movement, or control instructions.

Machine code is distinct from assembly language, which is a higher-level representation that uses mnemonics and symbols rather than pure binary, making it somewhat easier for humans to read and write. High-level programming languages, on the other hand, are designed to be more abstract and user-friendly, often allowing complex operations to be written in a more understandable syntax. Script languages typically provide an even higher level of abstraction and are often interpreted rather than compiled directly into machine code.