[Yandex Cloud documentation](../../index.md) > [Yandex Object Storage](../index.md) > Concepts > Overview

# Object Storage concepts

Object Storage uses the following basic terms:


Term | Description
--------|----------
[Bucket](bucket.md) | Object Storage unit allocated for user data.
[Object](object.md)  | File with data in any format.
[Bucket versioning](versioning.md) | Feature that allows you to store multiple copies of an object in a bucket.
[Object lock](object-lock.md) | Feature that protects an object version against deletion or overwrite.
[Partial object updates](object-patch.md) | Feature that enables partial updating and appending of objects data.
[Encryption](encryption.md) | Data encryption algorithm.
[Bucket object lifecycles](lifecycles.md) | Rules for automatically deleting objects and changing their storage class.
[Object metadata export](s3-inventory.md) | Retrieving metadata of all bucket objects for further analysis and cataloging.
[Pre-signed URLs](pre-signed-urls.md) | Method for granting anonymous users access to storage operations.
[Multipart upload](multipart.md) | Method for uploading large objects.
[Access control list](acl.md) | Tool for granting access to objects and buckets.
[Access policy](policy.md) | Tool for managing permissions to perform actions with objects and buckets.
[Uploading data via an HTML form](presigned-post-forms.md) | Method for uploading objects to a storage from a browser that allows anonymous users to upload objects to buckets.
[Storage class](storage-class.md) | Way to reduce the cost of storing objects by dividing them into frequently accessed objects and long-term storage objects.
[Backups](backup.md) | Process for backing up data stored in Object Storage.
[Labels](tags.md) | Key-value pairs for logical bucket tagging.
[Quotas and limits](limits.md) | Service use restrictions.




See also the Yandex Cloud [general resource hierarchy](../../resource-manager/concepts/resources-hierarchy.md).

#### Useful links {#see-also}

* [Webinar: Reducing load on high-traffic infrastructure with Cloud CDN](https://yandex.cloud/ru/events/1489?utm_source=docs&utm_medium=yandex&utm_campaign=infra&utm_content=vebinar&utm_term=cdns3)