Why we use header files

Answer 1

to describe about the data packets
what size
what type
encoding scheme
encryption standards
identifier to arrange packets at destination
routing details in circuit switched networks

oops I described something else 😅 studying web dev that's y , I guess here's the one ur looking for
those are already written c programs called libraries which you need to use to write your codes

for example , a normal printf instruction is many lines long actually , but it's only one line for u coz u use
stdio

Answer 2

@gordie 👌, thx for appropriate answer

Answer 3

in addition, using headers organize your code, but the down side of it, it's make compilation slower.