There is no one answer to this kind of question. It depends on why you wish to enter the UK. The entry requirements are different if you wish to visit, study, work or live in the UK permanently. It also depends on your own nationality.
If you are European, entry to the UK for almost any reason is very straightforward. some other countries such as the US have agreements to allow their nationals entry for visits without visas. Many other nationalities will need a visa for any kind of entry.
Most nationalities other than European will need a visa to study, live or work in the UK.
The rules are complex, as they are for most countries so it is important to contact the British Embassy in your own country to find out exactly what is required. If a traveller does not have the right documents, most airlines will refuse boarding. Even if a traveller makes it to the UK border, they won't be permitted to enter without the right documents. Make sure they are right before you travel.
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