What is the difference between 'service apache2 reload' and 'sudo systemctl restart apache2'?

Question

What is the difference between service apache2 reload and sudo systemctl restart apache2?

I understand that one uses sudo and others don't. Also, I can understand the difference between reloading and restart. But what is the major difference between these two commands?

Answer 1

Restart = stop + start
Reload = remain running + re-read configuration files

Answer 2

We could define it like this:

Restart--> STOP the service and then it will START the service.

Now comes Reload option.

Reload--> Read .service file for which you have executed the command and if any changes happened it will start using those changes now, so each time a change happens in any service file a reload is needed. You could even see this message coming, lets say you have changed a service and you forgot to reload it so whenever you run any systemctl command towards that service it will throw an error to reload it.