> For the complete documentation index, see [llms.txt](https://checker-docs.gitbook.io/checker-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://checker-docs.gitbook.io/checker-docs/1.-getting-started/1.1-product-overview-what-is-checker-and-what-does-it-do.md).

# 1.1 Product Overview: What is Checker and What Does it Do?

**1.1.1 Purpose of Checker**

**Checker** is a software service that helps businesses protect real and reliable user data. It provides **real-time protection**against issues commonly encountered in user registration-based systems, particularly in **SaaS** and **e-commerce platforms**, such as fake account creation, temporary email usage, and system abuse. It detects and blocks temporary email usage by analyzing email addresses during the registration process.

<figure><img src="/files/6t9OI788kLimWT2eKtib" alt=""><figcaption></figcaption></figure>

**1.1.2 Core Functions and Benefits**

* **Real-Time Verification** Checker's API checks whether an email address is temporary at the moment of registration and enables immediate action.
* **Extensive Database** It has a powerful and comprehensive database containing more than 170,000 temporary email domains.
* **Low Latency** It operates with an average response time of 100ms, performing verification without affecting user experience.
* **Stays Updated** It scans temporary email services daily, adding new threats to the database. This way, your system is always protected.

#### 1.1.3 Why Such a Tool is Needed

Temporary email services make it easy for users to create short-term or anonymous accounts. However, this situation leads to serious problems such as:

* Abuse of free trial rights,
* Exploitation of promotional campaigns,
* Creation of multiple fake accounts by the same person.

By preventing such abuses, Checker:

* Reduces your revenue loss,
* Frees your system from fake traffic load,
* Enables you to work with genuine users.