why use auto increment in sql code example

Example 1: id increment ms sql server

CREATE TABLE Persons (
    Personid int IDENTITY(1,1) PRIMARY KEY,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255),
    Age int
);

Example 2: what is auto increment in sql

Autoincrement keyword allows the
user to create a unique number to get
generated whenever a new record is
inserted into the table.
This keyword is usually required 
whenever PRIMARY KEY in SQL is used.

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