.png - ability to maintain a transparent background. good for logos.
.jpg - more common image format. used for general image rendering and also has a higher quality than the .png format.
Ancient mode of transmission are used by people in the past while modern mode of transmission are used by present people
One of the founders of Foursquare is Dennis Crowley. The other is Naveen Selvadurai. I know you didn't ask for both but I wanted to give them to you just in case. I hope this helps! (:
Viable and true. hope this helps!
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The sign to click is a "-" sign (minus)