What are the differences between the concepts of Britain, England, Britain and Great Britain?

Britain, England, Britain and Great Britain are the name changes caused by the changes of territorial countries and federal countries. Its territory is different.

Britain:

The word "Britain" is basically used to refer to "the United Kingdom of Great Britain and Northern Ireland" in the current Chinese context. However, I'm afraid this abbreviation, literally, must be the abbreviation of the now defunct "Kingdom of England".

However, because using "Britain" to refer to "the United Kingdom" has become an idiom in Chinese, modern Chinese still uses this inaccurate usage, just as China people are used to using the word "Netherlands" to refer to "the Kingdom of the Netherlands".

England:

"England" is a region on the island of Great Britain, which is located in the south of Scotland and the east of Wales, and also includes some outlying islands.

England, Wales, Scotland and Northern Ireland are now under British jurisdiction.

Historically, England, Wales, Scotland and Ireland have existed as independent countries for a long time. However, as Wales was completely incorporated into the ruling system of the Kingdom of England around 1542, the modern "Britain" with England as the core gradually developed.

Later, the Kingdom of England and the Kingdom of Scotland merged into the Kingdom of Great Britain in 1707, and the Kingdom of Great Britain and the nominally existing Kingdom of Ireland merged into the United Kingdom of Great Britain and Ireland in 180 1. Finally, it was renamed the United Kingdom of Great Britain and Northern Ireland at 1927.

Britain:

"Britain" in a narrow sense is usually a geographical concept, which can refer to the "British Isles"-an island group in northwest Europe, which consists of two big islands, namely "Great Britain" and "Ireland", as well as many small islands and island groups such as the Isle of Man and the Orkney Islands. It can also refer to the "British Island", the core island of the British Isles.

Great Britain:

"Great Britain" in a narrow sense is usually a geographical concept, that is, "Great Britain Island", which is one of the main components of the "British Isles", that is, the islands where England, Wales and Scotland are located.

The geographical term "Great Britain" is to a great extent relative to the "Brittany" region in northwest France.

After the formation of ancient Brittany (because bretons on the island of Great Britain fled to the south), the jurisdiction of the British province of the Roman Empire (that is, the area south of Hadrian's Great Wall on the island of Great Britain, roughly equivalent to England+Wales) was often called "Great Brittany".

Later, two geographical concepts of "Great Britain (Great Britain Island)" and "Little Britain (Brittany Peninsula)" were gradually derived.