noun
character string; string
Computing term for a sequence of characters. Often used in programming contexts.
この関数は文字列を返します。
This function returns a character string.
パスワードは8文字以上の文字列にしてください。
Please make the password a string of at least 8 characters.
列 means a row or sequence; 文字列 specifically means a sequence of characters.
Compound of 文字 (character) and 列 (sequence). A straightforward modern technical term.