In other countries, such as Italy and India, the motorcycle horn is one of the most important safety devices of any vehicle. Consequently, Royal Enfields and many Italian bikes come with powerful dual units.
In most countries, such as Australia, you can use it sparingly to alert traffic, animals or as part of an anti-theft device.
A short “toot-toot” is a great way of alerting traffic to your presence and a lot less offensive than overly loud exhausts. Plus, the noise is pointed forwards, not backwards like an exhaust, and is an alert tone that drivers will recognise.
But be aware you cannot use the horn excessively such as constantly blowing it as you filter down a long line of traffic.
Your motorcycle horn is also handy for warning animals and birds to get off the road.
I find it is better than those wind-activated supersonic whistles you can attach to your bike.