Systems | Development | Analytics | API | Testing

What Is an API? A Complete Guide to Application Programming Interfaces

Last updated: May 2026 An API (Application Programming Interface) is a set of rules and definitions that lets one software system request data or services from another. APIs are the connective tissue of modern software — every time a mobile app shows live data, a website logs you in with Google, or a SaaS tool talks to your CRM, an API is doing the work in the background.

Replay Real Customer API Sessions as Datadog Synthetics Tests

A customer pings support: “I tried to check out twice this morning and got a 500 each time, but it works fine for everyone else.” The session ID is in the email. You have full request/response capture in your environment, you have Datadog Synthetics already running browser checks against the same flow, and you still spend the next two hours grepping logs because none of those tools let you say “show me just this user’s requests, in order, and re-run them.”

The 16 Best Automation Testing Tools to Use in 2026

The automation testing landscape looks different in 2026. AI-powered tools are changing how teams build and maintain test suites, frameworks like Playwright have overtaken older tools in developer popularity, and no-code platforms have made quality testing accessible to teams without dedicated QA engineers. Choosing the right tool depends on your technical skill level, what you’re testing, how much you want to pay, and how much ongoing maintenance you can handle.

Reclaim Data Sovereignty for the AI Era

For the modern IT leader, managing a hybrid cloud often feels like navigating a series of operational constraints rather than executing a strategy. You’re caught between the board’s demand for immediate AI results with disparate data silos, rising egress costs, inflexible consumption models, overworked employees, and the looming impact of hardware refresh cycles. There’s a constant friction between the agility of the cloud and the resilience of your on-premises core.

Why we built a dedicated SDK for realtime AI streaming

If you've built a conversational AI feature, you know the pattern. Client sends a message, backend calls a model, response streams back over HTTP. SSE mostly, or WebSockets if you need bidirectional. For a single user on a single device, it works well. The trouble is the best AI products right now have moved well past that.

Choosing the right HPC Optimization Strategy and Key Challenges

The cost your CFO sees and the cost your CFO does not! This article is worth your time! Your CFO sees the invoice. Rack space. Cooling infrastructure. Software licenses. Network bandwidth. The quarterly HPC bill lands on the desk, gets reviewed against the budget, and moves on. But here is the question that rarely makes it into that review: How much of that infrastructure investment is actually working for you?

Xcode Guide: What It Is and How to Get Started

Xcode is the default development environment for building apps on Apple platforms. If you’re creating iOS, macOS, watchOS, or tvOS apps, you’ll end up in Xcode – whether you planned to or not. Xcode is powerful, reliable and intuitive. But it’s also opinionated. Learning how it expects you to work is often the difference between feeling productive and stuck.

What Makes Property Valuations Reliable (and How to Get an Accurate One in PropTech)

Accurate property valuations are critical for almost every real estate decision — from brokerage operations and investment analysis to listing pricing, lending workflows, and instant home valuation widgets in PropTech platforms. They are designed to bring clarity. In practice, different tools, portals, and AVM‑powered products may produce different numbers for the same property. Sometimes they are closely aligned, sometimes they diverge significantly.