A beta version of a program, game etc… is an unfinished version released to either the public a select few or whoever signs up to beta test it for bugs or glitches (Source: Urban Dictionary) The focus of beta testing is reducing impacts to users The process of delivering a beta version to the users is called beta release and this is typically the first time that the software is available outside of the organization that developed it. (Source WikiPedia)
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Beta (UK: //, US: //; uppercaseΒ, lowercaseβ, or cursiveϐ; Ancient Greek: βῆτα, romanized: bē̂ta or Greek: βήτα, romanized: víta) is the second letter of the Greek alphabet. In the system of Greek numerals it has a value of 2. In Ancient Greek, beta represented the voiced bilabial plosive /b/. In Modern Greek, it represents the voiced labiodental fricative /v/ (while /b/ in foreign words is instead commonly transcribed as μπ). Letters that arose from beta include the Roman letter ⟨B⟩ and the Cyrillic letters ⟨Б⟩ and ⟨В⟩.