int and varchar After the meaning of numbers

Meaning of numbers after int (1) and varchar (4)

Int (1), tinyint (4) which is larger.
int big.
Note the number in parentheses after the numeric type, which does not represent the length, represents the width of the display, which is different from the numeric meaning behind varchar and char.
That is, regardless of the number behind the int, the range is always -2^31 to 2^31-1, but int (1) shows only single-digit digits

Data type of integral type the number in parentheses, regardless of the amount of storage space, is the same
tinyint a byte smallint two bytes mediumint three bytes

The bracket char (1) in the varchar char represents a character, such as ' A ' ' man ' denotes the number of characters

varchar (50) can store 50 characters