While there is no legal obligation for landlords to take out insurance, you are likely to be required to do so by your mortgage provider.
Landlords insurance protects you from financial losses incurred through your day to day rental activities. It differs from standard home insurance in that its more specific, with cover designed solely to protect your rental property and tenants, against your unique risks:
Non payment of rent
Damage to your property by the tenant
Loss of earnings / rehousing costs if the tenants have to move out following an insured event
Liability for accidents in your property causing injury