Buy-to-let is fairly self-explanatory - it involves purchasing a property with the intention of letting it to a tenant for a monthly fee.
Owning a buy-to-let property comes with a wealth of responsibilities, some of which are compulsory and some depend on how much of an active investor you are.
Being a landlord, you will be responsible for maintaining your rental property, unless you choose to go with a property management company.
Similarly, you'll be required to find your own tenants and market the property yourself, unless you work alongside a letting company.