what is alpha version and beta version of an app

what is alpha version and beta version of an app Product Description：

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Product parameters：283697

Available Colors：#348560

Available Sizes：541 * 181 * 535

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country of origin：USA

Customer Reviews：what is alpha version and beta version of an app é um caça-níqueis Relax Gaming que tem como tema zumbis que escaparam de um circo..