Glossary · MeasurementTOFU
First-party data
The short answer
First-party data is information your customers share directly with you — email addresses, phone numbers, purchase history, preferences, survey answers and on-site behaviour — collected through your own website, app, store or conversations.
As browsers and platforms restrict third-party tracking, first-party data has become the foundation of effective targeting and measurement.
What it powers
- Customer match and lookalike audiences
- Better conversion matching via Conversions API and enhanced conversions
- Suppression — excluding existing customers from acquisition campaigns
- Personalised CRM journeys across email and WhatsApp
- LTV and cohort analysis
First-, second- and third-party data
- First-party — collected directly by you
- Second-party — another company's first-party data shared with you under agreement
- Third-party — aggregated by companies with no direct relationship to the individuals
First-party data sources
| Source | Data |
|---|---|
| Website and app | Behaviour, sign-ups, purchases |
| CRM | Leads, outcomes, customer history |
| Email and WhatsApp | Opt-ins, engagement |
| Stores | Purchases linked to loyalty or e-bills |
| Surveys and quizzes | Preferences (zero-party data) |
First-party data in practice
A brand collects email, phone and purchase history with consent at checkout and through a loyalty programme, then uses it for personalised messages and to build lookalike audiences.
Ways to collect it
- Checkout and account sign-ups
- Quizzes and calculators
- Loyalty programmes
- WhatsApp opt-ins
First-party data in India
India's data-protection framework requires notice and consent for personal data, making clear consent capture and data minimisation part of any first-party data strategy.
Frequently asked questions
How do we collect more first-party data?
Offer genuine value in exchange — WhatsApp updates, loyalty benefits, useful tools, faster checkout — and ask for consent clearly.
Does India's DPDP Act affect first-party data?
Yes. Collect with clear notice and consent for defined purposes, and honour rights to access and erasure.
Is first-party data more accurate than third-party data?
Usually, because it comes directly from your own customers and interactions.
How should first-party data be shared with ad platforms?
Hashed, with consent, through official integrations such as Customer Match or Conversions API.
Why is first-party data more valuable now?
Privacy changes limit third-party tracking, so consented customer data powers targeting and measurement.
Is phone number data valuable for marketing?
Yes — with consent, it powers WhatsApp, SMS and customer-match audiences.
Related terms
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