There are several kinds of travel-related insurance, sometimes sold as a package, sometimes separately:
The first one is probably less useful for you, if you are covered through the “European Health Insurance Card” (EHIC) system. Some details are a little complex but it would for example pay for hospitalization elsewhere in the EU. Depending on local rules, some costs might not be fully covered and an additional medical emergency/health insurance could make sense to cover the difference but it should at least avoid any catastrophic medical bill. If you don’t already have an EHIC, check with the local insurer/social security administration if you are eligible and carry it with you.
Others (like the liability insurance or insurance against theft) are possibly already included in some other insurance contract you have (e.g. in France, it’s common to have a generic liability insurance as part of a home insurance package) or through a premium credit card (e.g. repatriation or cancellation might be covered if you use the card to pay for the tickets).
In all cases, it’s difficult to decide for you if it’s “necessary”. In some countries, liability or legal insurance is very common, in others not so much. As long as nothing happens, you don’t notice it but if you are faced with a huge liability, you are of course happy to have it. The whole point of insurance is that such events are not very common but can be very costly when they do happen.
But for the smallest items mentioned above (say luggage), you can also put some money aside and consider yourself self-insured. Insurers know more than you about the risks, want to make a profit and set prices accordingly. Since luggage does not cost so much and there is typically a rather low cap on claims, you can easily know what the “worse case scenario” is and decide that you have enough money to face these costs on your own.
Credit:stackoverflow.com‘