Step 1: Understanding the Concept:
The question describes a procedural device that allows a lawsuit to be brought by a few individuals on behalf of a larger group, where everyone in the group shares a common interest in the subject matter of the suit. This is an exception to the general rule that all persons interested in a suit should be joined as parties.
Step 2: Detailed Explanation:
This type of lawsuit is known as a Representative Suit. It is governed by Order I, Rule 8 of the Code of Civil Procedure, 1908. The main purpose of a representative suit is to avoid unnecessary expenditure and multiplicity of litigation when numerous people have the same interest.
\begin{itemize}
\item A Joint suit might refer to a suit with multiple plaintiffs or defendants, but it doesn't have the element of representation.
\item A Collusive suit is a fraudulent suit where the parties are not in genuine opposition but are conspiring to obtain a particular judicial decision.
\item Collective suit is a general term but not the specific legal term used in the CPC.
\end{itemize}
The key elements of a representative suit are: (i) numerous parties, (ii) same interest, and (iii) permission of the court.
Step 3: Final Answer:
A suit filed by one or more persons on behalf of a larger group with the same interest is called a Representative suit.