The **`time` function** is a C library function that returns the time since the Epoch (00:00:00 UTC, January 1, 1970) in seconds. 

To use the `time` function, the `time.h` header file needs to be included in the program, as shown below:
```C
#include <time.h>
```

# Syntax 
An object of the`time_t` type is used for the function declaration as shown below:
```C
time_t time(time_t *second)
```

# Parameters
The function takes a single parameter (second) of the `pointer` type used to set the `time_t` object. 

# Return Value 
The current time is returned in the `time_t` object type.

# Example
The code below shows the use of the `time` function in C: 

#include <stdio.h>
#include <time.h>

int main(){
  //Declare the time_t object 
  time_t seconds;
  seconds = time(NULL);
  
  //Display the time in seconds 
  printf ("Seconds passed since Jan 1, 1970: %ld", seconds);
  return 0;
}

What is time() in C?

Returns seconds since Epoch; use `#include <time.h>` and `time_t time(time_t *second)` for implementation.