What is the difference between appending a list and extending a list?

Q. What is the difference between appending a list and extending a list?

Answer =

The append() can add a single elements to the end of the list while extend() can add argument-list’s all elements to the end of the list.

After append(), the length of the list will increase by 1 element only while after extend(), the length of the list will increase by the length of inserted list.