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README.md

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+# Let's Encrypt Adoption Among the Top 5,000 Companies
+
+## Overview
+
+This dataset analyzes Let's Encrypt adoption across the world's top 5,000 companies.
+
+It identifies companies whose websites use Let's Encrypt issued SSL/TLS certificates, providing a snapshot of Let's Encrypt adoption among large organizations.
+
+The dataset is intended for technology research, cybersecurity analysis, technographic research, competitive intelligence, market analysis, and data science.
+
+## Dataset Highlights
+
+* 5,000 large companies analyzed
+* Identifies Let's Encrypt adoption at the company and website level
+* Focused on large organizations
+* Useful for analyzing SSL/TLS certificate technology adoption
+* Suitable for research, visualization, segmentation, and machine learning projects
+
+## What is Let's Encrypt?
+
+Let's Encrypt is a free, automated, and open Certificate Authority that provides SSL/TLS certificates. It enables websites to deploy HTTPS without purchasing certificates from traditional commercial certificate authorities.
+
+## Dataset Fields
+
+| Field         | Description                                  |
+| ------------- | -------------------------------------------- |
+| Company       | Company or organization name                 |
+| Domain        | Primary website domain                       |
+| Let's Encrypt | Indicates whether Let's Encrypt was detected |
+| Technology    | Detected technology name                     |
+| Country       | Company or website country, where available  |
+
+Refer to the accompanying dataset file for the complete list of fields and values.
+
+## Methodology
+
+Websites were analyzed for technical fingerprints associated with Let's Encrypt. A company is considered a Let's Encrypt adopter when the relevant certificate or technology footprint is detected on its associated website.
+
+Technology detection represents an observation at the time of collection and should not be interpreted as confirmation of an organization's complete infrastructure.
+
+## Use Cases
+
+This dataset can be used for:
+
+* Technographic research
+* Cybersecurity research
+* SSL/TLS infrastructure analysis
+* Market research
+* Competitive intelligence
+* Data science and machine learning
+* Technology adoption analysis
+* Academic research
+
+## Important Notes
+
+* Technology detection is based on publicly observable website signals.
+* A detected Let's Encrypt certificate does not necessarily mean that Let's Encrypt is used across all of an organization's domains or infrastructure.
+* Website infrastructure can change over time.
+* Results represent observations from the dataset's collection period.
+* The dataset should not be interpreted as an official statement from any company regarding its technology stack.
+
+## License
+
+Please refer to the repository license for permitted uses, redistribution, and attribution requirements.