The fields on this screen determine some of the basics of your site setup.
Most themes show the site title at the top of every page, in the title bar of the browser, and as the identifying name for syndicated feeds. Many themes also show the tagline.
You can set the language, and WordPress will automatically download and install the translation files (available if your filesystem is writable).
UTC means Coordinated Universal Time.
You must click the Save Changes button at the bottom of the screen for new settings to take effect.