add sections for data linking tables

source/data/data-linking/index.html.md.erb

@@ -0,0 +1,10 @@
+---
+title: Data Linking
+weight: 100
+last_reviewed_on: 2024-01-24
+review_in: 1 year
+show_expiry: true
+owner_slack: '#ask-data-linking'
+---
+
+<%= partial 'documentation/data-docs/curated-databases-docs/data-linking' %>

source/documentation/data-docs/curated-databases-docs/data-linking.md

@@ -1,3 +1,12 @@
 # Data Linking
 
-As an analyst it is important to be able to link together different datasets across domains.
+As a department, we struggle with a lack of consistent, reliable, unique identifiers within and across our systems. Unique IDs are critical to getting a true picture of the justice system and as an analyst it is important to be able to link together different datasets across domains.
+
+The Internal Data Linking team have created Data Linking tables (using the [Splink](https://moj-analytical-services.github.io/splink/index.html) under the hood) for use across Data & Analysis to allow analysts to:
+
+1. Deduplicate Individual Datasets
+2. Link between Datasets (i.e. across domains)
+
+The Data Linking tables contain estimated unique IDs attached to each ID within the linked datasets. They function as a lookup table that associates a raw system ID with the unique linked ID we have generated. This linked ID can then be used to deduplicate and/or link datasets.
+
+For more on the Data Linking tables, how they are made and how to use them, check out the [data discovery tool](https://data-discovery-tool.analytical-platform.service.justice.gov.uk/data_linking_anonymised/index.html).

source/documentation/data-docs/curated-databases-docs/index.md

@@ -6,4 +6,5 @@ This is guidance contains information on using curated databases on the Analytic
 * [Amazon Athena](amazon-athena/)
 * [Querying Athena from the AP](dbtools/)
 * [Databases](databases/)
+* [Data Linking](data_linking/)
 * [Data Discovery Tool](data-documentation/)