> For the complete documentation index, see [llms.txt](https://ciusji.gitbook.io/guinsoo/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ciusji.gitbook.io/guinsoo/guides/introduction.md).

# Introduction

## Main Features

* A very fast database engine
* Open source
* Written in Java
* Supports standard SQL, JDBC API
* Embedded and server mode, clustering support
* Strong security features
* The PostgreSQL ODBC driver can be used
* Multi-version concurrency

## Connection Modes

The following connection modes are supported currently:

* Embedded mode (local connection using JDBC)
* Server mode (remote connections using JDBC or ODBC over TCP/IP)
* Mixed mode (local and remote connections at the same time)