One of the security features of Snowflake includes the periodic rekeying of encrypted data, which is available with the Snowflake Enterprise edition and higher2. This ensures that the encryption keys are rotated regularly to maintain a high level of security. References: [ COF-C03 ] SnowPro Core Certification Exam Study Guide

A schema in Snowflake is a logical grouping of database objects, such as tables and views, that belongs to a single database.Each schema is part of a namespace in Snowflake, which is inferred from the current database and schema in use for the session5

Snowflake allows secure data sharing for specific database objects to ensure data is shared securely and efficiently. The primary objects that can be shared securely are tables and secure views.
Tables: Share actual data stored in tables.
Secure Views: Share derived data while protecting the underlying table structures and any sensitive information.
References:
Snowflake Documentation: Introduction to Secure Data Sharing
Snowflake Documentation: Creating Secure Views

When unloading data using the COPY INTO < location > command, Snowflake offers options to compress files. The default behavior is governed by the COMPRESSION parameter. Setting COMPRESSION = AUTO allows Snowflake to automatically use its default compression algorithm, which is GZIP for most formats like CSV.
Reference:
Snowflake Docs: COPY INTO < location > (unloading)
Default: COMPRESSION = AUTO (GZIP for CSV)

Snowflake uses both Discretionary Access Control (DAC) and Role-Based Access Control (RBAC) to manage access control. DAC allows object owners to grant access privileges to other users. RBAC assigns permissions to roles, and roles are then granted to users, making it easier to manage permissions based on user roles within the organization.
Snowflake Documentation: Access Control in Snowflake