In C#, data types are broadly categorized into Value Types, Reference Types, Pointer Types, and Nullable Types.

Value Types

Whole Numbers

Type	Size	Range
byte	8-bit	0 to 255
sbyte	8-bit	-128 to 127
short	16-bit	-32,768 to 32,767
ushort	16-bit	0 to 65,535
int	32-bit	-2,147,483,648 to 2,147,483,647
uint	32-bit	0 to 4,294,967,295
long	64-bit	Very large range
ulong	64-bit	0 to very large number

Floating Point Numbers

Type	Size	Precision
float	32-bit	~7 digits
double	64-bit	~15-16 digits
decimal	128-bit	~28-29 digits (higher precision, used for financial calcs)

Other value types char – 16-bit Unicode character

bool – true or false

enum – User-defined enumeration

struct – User-defined value type

Reference Types

Refrerence Types refer to strings, classes objects arrays etc.