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  Terraform Data Sources and Dependencies: Implicit vs. Explicit Your complete guide to understanding how Terraform discovers, fetches, and connects infrastructure—and how to control it when automatic dependency detection isn't enough. 📅 Published: Feb 2026 ⏱️ Estimated Reading Time: 22 minutes 🏷️ Tags: Terraform Data Sources, Dependencies, Resource Graph, Implicit Dependencies, Explicit Dependencies 🧠 Introduction: The Invisible Graph Terraform's Superpower When you run  terraform apply , something magical happens.  Terraform doesn't just execute your configuration line by line. It builds a  dependency graph —a map of every resource, data source, and module, connected by their relationships to each other. hcl resource "aws_vpc" "main" { cidr_block = "10.0.0.0/16" } resource "aws_subnet" "public" { vpc_id = aws_vpc.main.id # ← Terraform sees this reference cidr_block = "10.0.1.0/24" } Ter...