というのは

というのは
expression
the reason is; because; meaning that
1. the reason is; that is because
used to introduce an explanation or reason for something previously stated
()けません。というのは、予定(よてい)があるからです。
I can't go. The reason is that I have plans.
というのは、彼女(かのじょ)()るからだ。
That's because she's coming.
遅刻(ちこく)した。というのは、電車(でんしゃ)(おく)れたのだ。
I was late. The reason is that the train was delayed.
2. what I mean is; that is to say
used to clarify or elaborate on a previous statement
成功(せいこう)」というのは(ひと)によって(ちが)う。
'Success' means different things to different people.
つまり、というのは、時間(じかん)がないということです。
In other words, what I mean is that there's no time.
和食(わしょく)」というのは日本(にほん)伝統的(でんとうてき)料理(りょうり)のことだ。
'Washoku' refers to traditional Japanese cuisine.

EXPLANATORY EXPRESSION:
というのは serves two main functions: providing reasons/explanations, and defining or clarifying terms.

PATTERN 1 - GIVING REASONS:

[Statement]. というのは、[reason]からだ。

  • Often used at the start of a sentence to explain the previous statement
  • Similar to なぜなら(なぜなら) (because)

PATTERN 2 - DEFINING TERMS:

「X」というのは Y のことだ/である

  • Used to explain what a word or phrase means
  • Common in explanations and lectures

RELATED EXPRESSIONS:

  • なぜなら(なぜなら) - because (more formal)
  • というのも - the reason being
  • (よう)するに - in short