Different-colored bubbles on iPhone text messaging?

I am a new iPhone owner and when sending text messages, some bubbles with my sent texts are in blue, others are in green. Anyone know what this means?

SRΛSC2015-05-28T19:45:40Z

Blue - iMessage, internet based, between Apple devices
Green - SMS message, carrier based, any phone

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Dylan2015-05-28T19:41:24Z

Blue=iMessage, between you and another Apple user
Green=Text message, between you and someone without an Apple product

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?2015-05-30T06:19:44Z

Green=non-iOS user
Blue=iOS user
Blue texts are free over wifi, by the way :D

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