struct definition with ':' after name of the variable

I’m reading about structs in C and I came across some interesting declaration that I don’t know what does is mean. The declaration goes as follows:

typedef struct name{
   int x :1;
}name;

what does line ‘int x :1;’ mean ? is 1 the default value of x?

Would appreciate help! Thanks

>Solution :

It specifies the number of bits to use for that field. It is called "bit field".

Check this: https://en.cppreference.com/w/cpp/language/bit_field