# Mindee V1 Glossary

This glossary introduces common Mindee terminology. You will frequently encounter these concepts throughout this doc as Mindee is centered around them.

* **Annotation**: These are the labels used to train custom APIs; in other words, it refers to labels produced and provided to our API when the training Interface is used.
* **API**: An API (Application Programming Interface), is an interface that define how applications or devices can connect to and communicate with each other defined by a set of protocols and rules.
* **Documents**: This includes semi-structured documents such as an invoice, receipt, ID document, W9-forms, train-ticket, etc in a PDF or image format.
* **Endpoint**: An API endpoint is a specific point of entry translated in a unique URL to access a specific API or API feature. As an example `https://api.mindee.net/v1/products/mindee/expense_receipts/v3/predict` is the endpoint to access the receipts predict API.
* **Labels**: A label key is a list containing valid JSON objects whose format depends on the type of feature you are annotating.
* **Models**: Models are machine learning files that can be trained to carry out specific tasks such as extracting the total amount info from receipts etc.
* **SDK**: SDK (Software Development Kit) is a set of software development tools developers can use to facilitate the creation of applications.
* **OpenAPI Definition**: This is a specification that defines a standard, language-agnostic interface to RESTful APIs.
* **Payload**: A payload refers to the data that you submit to the Mindee server when you are making an API request.
* **Predictions**: This refers to response or results that our APIs deliver on a given document.