Explain the difference between `logic` and `bit` data types in SystemVerilog

In SystemVerilog, the focus keyword for understanding the distinction between `logic` and `bit` data types lies in their representation and usage.

Logic Data Type:

The `logic` data type in SystemVerilog is a 4-state data type that can take on four possible values: 0, 1, X (unknown), and Z (high-impedance). It is commonly used for modeling digital circuit behavior, as it reflects real-world scenarios where signals can be in an unknown or high-impedance state.

Bit Data Type:

On the other hand, the `bit` data type in SystemVerilog is a 2-state data type that can only have two values: 0 or 1. This data type is typically utilized when a designer wants to work with binary values and does not require the additional Z and X states provided by the `logic` data type.

In summary, while `logic` allows for more comprehensive modeling of digital circuit behavior with its 4-state representation, `bit` simplifies the representation to a basic 2-state logic for more straightforward applications.