Strings
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A string is a series of characters, such as "hello world."  TIOS defines them within quotation marks ("").  Built in, there are 10 string variables (Str0-Str9) that can be used by the user and by TI-Basic programs.  Every character is valid to be entered into a string, excluding a quotation mark ("), a newline, and the /->/ symbol.  It is, however, possible to get these characters into strings.  String variables are accessed through the Vars menu, [2nd]+[Vars]+[7] will pull up a list of strings.
Storing to Strings
Strings are stored to like so: "Hello"/->/Str0 This will store the text "Hello" into Str0.