What is an API? Explained in Plain English
An API (Application Programming Interface) lets two pieces of software talk to each other. For business owners, think of it as a waiter that takes your order to the kitchen and brings back your food.
An API (Application Programming Interface) lets two pieces of software talk to each other. For business owners, think of it as a waiter that takes your order to the kitchen and brings back your food.
What an API does — the waiter analogy
Imagine you are sitting in a restaurant. You give your order to the waiter, who takes it to the kitchen. The kitchen prepares your food and the waiter brings it back to your table. You do not need to know how the kitchen works, what ingredients they use or who the chef is. You just need the waiter to deliver your request and bring back the result. That is what an API does. Your software (the customer) sends a request to the API (the waiter), which communicates with another system (the kitchen) and returns the response. For example, when you check a payment on your e-commerce site, the website sends an API request to the payment gateway, which processes the transaction and sends a response back. The website never needs to know how the payment gateway works internally. It just needs the API to handle the conversation.
Types of APIs: REST, GraphQL and SOAP
Not all APIs work the same way. The three main types you will encounter in business software development are:
| Type | How it works | Best for | Complexity |
|---|---|---|---|
| REST | Uses standard HTTP methods (GET, POST, PUT, DELETE) over URLs | Most web and mobile applications | Low |
| GraphQL | Client queries exactly the data it needs from a single endpoint | Complex data requirements, multiple data sources | Medium |
| SOAP | Uses XML messages over HTTP or other protocols | Enterprise systems, banking, compliance-heavy industries | High |
For most modern business applications — websites, mobile apps, e-commerce, CRM integrations — REST is the standard. GraphQL is growing in popularity for applications where different clients need different data. SOAP is older and heavier but still used in financial services and government systems where formal contracts matter.
Real-world API examples you use every day
APIs are everywhere in business software. Here are examples you have almost certainly used:
- Payment gateways. When a customer pays on your website, an API sends the payment details to a processor like Stripe, PayPal or Tabby. The processor authorises the payment and sends a response back. Your site never handles the credit card data directly.
- Google Maps. If your site shows a map of your location, it is using the Google Maps API. Your website sends an address and the API returns map data, directions and Street View.
- Social login. Sign in with Google, Facebook or Apple — each uses an API to authenticate the user without sharing their password with your site.
- SMS and notifications. When your system sends an SMS or WhatsApp message to a customer, it uses an API to connect with services like Twilio or the WhatsApp Business API.
- Shipping and tracking. E-commerce sites use APIs to fetch shipping rates from carriers, generate labels and provide real-time tracking updates to customers.
Each of these is a waiter handling a conversation between your software and an external service.
Why APIs matter for your business
If you run a business, APIs affect you whether you know it or not. They are the invisible plumbing that makes modern software work. Here is why they matter at a business level:
- Automation. APIs let your CRM talk to your email platform, your accounting software and your e-commerce system without manual data entry. Data flows automatically between systems.
- Integration. You do not have to build everything yourself. An API lets your software use Stripe for payments, Twilio for SMS, Google for maps and Zoho for CRM — each best in class, connected through APIs.
- Scalability. Well-designed APIs let you add new features, channels and integrations without rewriting your core software. Your mobile app and website can share the same API, and adding a new sales channel means connecting to the same API.
- Speed to market. Instead of building a payment system from scratch (which would take months and require security compliance), you integrate a payment API in days.
For a practical example of how APIs enable automation, read our guide on API integration best practices.
API integration services at BahrainServer
At BahrainServer, we build and integrate APIs as part of custom software development. Our typical API work includes: integrating third-party APIs — payment gateways, shipping providers, CRMs, SMS and notification services, maps and location services, social logins, government and compliance APIs; building custom APIs — REST or GraphQL APIs for mobile apps, multi-vendor platforms, IoT systems and data exchange between internal business systems; and API documentation and versioning — so your development team or future partners can work with your API without confusion. If you are evaluating a software development partner, our guide to choosing a software development partner covers what to look for in technical capability, including API expertise.
Frequently asked questions
If your business uses any software that needs to share data with other software — an e-commerce site that processes payments, a CRM that syncs with your accounting system, a mobile app that displays data from a server — then you need APIs. Most modern business software relies on APIs whether you see them or not.
REST uses fixed endpoints that return predefined data structures. GraphQL lets the client request exactly the data it needs. REST is simpler and more widely supported. GraphQL is more flexible for complex or frequently changing data requirements.
APIs can be very secure when properly designed. Authentication (verifying who is calling the API), authorisation (what they are allowed to do), encryption (HTTPS), rate limiting and input validation are standard security measures. A poorly designed API without these protections is a security risk.
Integrating a third-party API (like payment gateway or SMS service) typically costs BHD 500-2,000 per integration depending on complexity. Building a custom API for your business, including documentation and security, starts at BHD 3,000 and can range up to BHD 15,000 for a complex system with multiple endpoints.
Yes. APIs are the backbone of business automation. They let your CRM talk to your email marketing platform, your e-commerce system update your inventory automatically and your accounting software pull transaction data without manual data entry. Any repetitive data transfer between systems is a candidate for API automation.