> For the complete documentation index, see [llms.txt](https://docs.vida.id/identity-stack/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vida.id/identity-stack/sign/introduction.md).

# Introduction

### What is VIDA Sign?

**VIDA Sign** is a secure, legally compliant, and user-friendly digital signature platform designed to streamline the process of signing contracts and documents online. It enables individuals and businesses to execute legally binding agreements from anywhere, at any time, without the need for printing, scanning, or in-person meetings.

Built for flexibility and integration, VIDA Sign offers a suite of APIs and ready-to-use components that fit seamlessly into various business workflows. Whether you’re an enterprise looking to embed digital signatures into your internal systems, or a developer building secure document flows in your app, VIDA Sign has tailored solutions to meet your needs.

{% hint style="info" %}
VIDA is a Certificate Authority (Penyelenggara Sertifikat Elektronik - PSrE) registered and certified in Indonesia by the Ministry of IT and Communications (Kominfo) to issue legally binding certificates to individual or entity that has been validated against the authoritative identity database.
{% endhint %}

### What is a Digital Signature?

A **digital signature** is a cryptographic method used to verify the authenticity and integrity of digital messages or documents. Unlike basic electronic signatures, digital signatures are **uniquely tied to the signer** and **impossible to forge without access to the signer's private key**.

Key characteristics of digital signatures:

* **Authentication**: Confirms the identity of the signer.
* **Integrity**: Ensures the document has not been altered after signing.
* **Non-repudiation**: The signer cannot deny having signed the document.
* **Legal validity**: Complies with global and Indonesian digital signature regulations.

Digital signatures are especially valuable in industries where **trust, compliance, and auditability** are critical such as finance, legal, healthcare, real estate, and government.

VIDA Sign’s digital signature engine is backed by **certificate-based PKI (Public Key Infrastructure)**, ensuring the highest level of trust and security.