[Rails] Sqlite3 is confused me fully ? What to give database extension (.db or .sqlite3)?

Hi all , 

I have create new application in rails with sqlite3 .

Its totally confusing to me when i see my database.yml file.

Reason of confusing is what type of extension  is given to database ?

I have knowledge that  by executing following line will create database :-

          sqlite3 test.db

See the extension of database is .db

But when i see my database.yml , extension of database is .sqlite3

database.yml is copied below. 

What is extension of database in sqlite3 ?

In my database.yml file 

 SQLite version 3.x

#   gem install sqlite3

development:

  adapter: sqlite3

  database: db/development.sqlite3

  pool: 5

  timeout: 5000

# Warning: The database defined as "test" will be erased and

# re-generated from your development database when you run "rake".

# Do not set this db to the same as development or production.

test:

  adapter: sqlite3

  database: db/test.sqlite3

  pool: 5

  timeout: 5000

production:

  adapter: sqlite3

  database: db/production.sqlite3

  pool: 5

  timeout: 5000

Thanks 

Best Regards

Fahim Babar Patel

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