"Sent_P" statement meaning request

Projects Programming
1

The following is in a water tank GUI using an esp8266 project for a smart
water level project by Farrak??

void handleRoot() {
server.send_P(200, "text/html;charset=UTF-8", index_html);
}

Please explain with it means, in detail. Also, when I compile his code with
Arduino's IDE, i get the following error message:

"exit status 1
expected primary-expression before ')' token"

2

Please provide a clickable link to Farrak's code.

3

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