Why do we need SEQUENCE for Id under PostgreSQL?

Question

PostgreSQL

docs.doctrine-project.org/en/latest/reference/basi...
One of the primary key definition types.
What does it give? Why and why? Worth using or not? Why?
I noticed that Doctrine 2 automatically creates this partition in the database. However, it is not entirely clear why this is, and what additional configs give to this parameter.

Answer 1

You can always use the AUTO strategy as it is cross platform. For PostgreSQL, sequence generators named {entityName}_{columnName}_seq will automatically be used . I think that after reading the documentation everything will become clear.
Is it worth using? Only if for the purity of the code, if the project is hard-wired to PostgreSQL.