A client application for QnA Maker is any conversational application that communicates with a user in natural language to answer a question. Examples of client applications include social media apps, chat bots, and speech-enabled desktop applications.

* **When you want to provide the same answer to a request, question, or command** - when different users submit the same question, the same answer is returned to both.

* **When you want to filter static information based on meta-information** - add [metadata](../how-to/metadata-generateanswer-usage.md) tags to provide additional filtering options relevant to your client application's users and the information. Common metadata information includes [chit-chat](../how-to/chit-chat-knowledge-base.md), content type or format, content purpose, and content freshness.

* **When you want to manage a bot conversation that includes static information** - your knowledge takes a user's conversational text or command and answers it. If the answer is part of a pre-determined conversation flow, represented in your knowledge base with [multi-turn context](../how-to/multiturn-conversation.md), the bot can easily provide this flow.