Meaning of upper and lower case

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oturan00 Posts 1 Registration date Tuesday April 26, 2016 Status Member Last seen April 26, 2016 - Apr 26, 2016 at 06:50 PM
xpcman Posts 19530 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 - Apr 26, 2016 at 07:13 PM
what that mean include both lower and upper case characters.
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xpcman Posts 19530 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 1,825
Apr 26, 2016 at 07:13 PM
lower case characters abcd...
upper case characters ABCD....
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