How does siri know what you say?

Siri understands what you say through a combination of advanced technologies and frameworks developed by Apple. At WWDC, Apple highlighted several key improvements and features that enhance Siri's capabilities:

Apple Intelligence: Siri leverages Apple Intelligence, which includes large language models that improve its ability to understand and process natural language. This allows Siri to sound more natural, be more contextually relevant, and understand more complex requests even if the user stumbles over their words. Bring your app to Siri
Semantic Indexing: Siri can perform semantic searches, meaning it understands the context of words beyond their literal meaning. For example, when searching for "pets," Siri can identify related terms like "cats" and "dogs." This is made possible by integrating app content into a semantic index. Bring your app to Siri
Speech to Text: Siri uses a Speech to Text model, which has been enhanced with a new API called Speech Analyzer. This API allows for more flexible and faster speech processing, supporting long-form and distant audio. This technology converts spoken words into text that Siri can interpret and act upon. Discover machine learning & AI frameworks on Apple platforms

These advancements make Siri more capable of understanding and acting on user requests, providing a more seamless and intuitive user experience.