AWS: What Is Amazon Web Services?

What is AWS?

Amazon Web Services (AWS) is Amazon's cloud division, launched in 2006 with the S3 storage service and the EC2 compute service. Since then, AWS has become the undisputed leader in cloud computing, holding approximately 31% of global market share ahead of Microsoft Azure and Google Cloud. The platform offers over 200 services covering all enterprise computing needs, from virtual machines to machine learning, managed databases, storage, networking, security, and IoT.

AWS operates a global network of 33 geographic regions comprising over 100 availability zones. Each region is a cluster of physically isolated data centres, providing redundancy and low latency to local users. For European businesses, the Frankfurt, Paris, Dublin, and Stockholm regions ensure compliance with European data regulations, particularly GDPR.

At Kern-IT, we are not tied to any specific cloud provider. We advise our Belgian clients on the best choice for their needs, and AWS is often a relevant option due to its maturity, breadth of services, and quality of documentation. We use S3 for file storage, CloudFront as a CDN, and Route 53 for DNS management when the project context warrants it.

Why AWS Matters

AWS has defined the standards of modern cloud computing and continues to innovate at a sustained pace. Its importance in the technology ecosystem stems from several key factors.

• Broadest range of services: with over 200 services, AWS covers every imaginable use case. From simple website hosting to machine learning model training, serverless architectures, and IoT, everything is available under one roof.
• Maturity and reliability: with nearly 20 years of experience, AWS has proven its reliability at scale. SLAs guarantee uptime above 99.99% for most critical services.
• Flexible billing model: pay-as-you-go pricing means you only pay for resources consumed. Reserved Instances and Savings Plans offer significant discounts for predictable workloads.
• Partner ecosystem: AWS has the largest ecosystem of partners, consultants, and third-party solutions. AWS certifications are among the most sought-after in the IT job market.
• Continuous innovation: AWS regularly launches new services and features, often ahead of the competition in areas such as serverless (Lambda), containers (ECS, EKS), and generative AI (Bedrock).

How It Works

AWS operates on an on-demand cloud services model. Users access resources through the web console, the command-line interface (AWS CLI), or SDKs available in many languages, including Python (boto3). Every service is accessible via a REST API, enabling complete infrastructure automation.

AWS services are organised into several categories. Compute services (EC2, Lambda, ECS) provide processing power. Storage services (S3, EBS, EFS) manage data. Database services (RDS, DynamoDB, Aurora) offer managed solutions for all database types. Networking services (VPC, CloudFront, Route 53) manage connectivity and content distribution.

Security is based on the shared responsibility model: AWS secures the physical infrastructure and base services, while the customer is responsible for the security configuration of their resources, access management (IAM), and data protection. This model requires a solid understanding of AWS security mechanisms to avoid common misconfiguration errors.

Concrete Example

For a Belgian client in the logistics sector, Kern-IT designed an architecture using several AWS services. The Django application, containerised with Docker, is deployed on an EC2 instance behind an Application Load Balancer. User-uploaded files (delivery documents, photos) are stored on S3, served via the CloudFront CDN for minimal latency. The PostgreSQL database is hosted on RDS with automatic backups and a read replica for analytical queries.

Route 53 manages DNS with automatic failover. CloudWatch monitors performance metrics and triggers alerts when thresholds are exceeded. The entire setup is provisioned via Terraform, ensuring infrastructure reproducibility and traceability.

Implementation

1. Create an AWS account: sign up at aws.amazon.com. Enable multi-factor authentication (MFA) on the root account immediately, and create dedicated IAM users for daily operations.
2. Define the architecture: identify the services needed based on project requirements. For a standard Django web application, start with EC2 (or ECS), RDS, S3, and CloudFront.
3. Configure networking: create a VPC with public and private subnets. Place application servers and databases in private subnets, accessible only via a load balancer or bastion host.
4. Automate with Infrastructure as Code: use Terraform or AWS CloudFormation to define and version your infrastructure. Never create resources manually in production.
5. Set up monitoring: configure CloudWatch to monitor key metrics (CPU, memory, latency, errors). Create dashboards and alerts for real-time visibility.
6. Optimise costs: use AWS Cost Explorer to analyse spending. Identify underutilised resources, activate Savings Plans, and configure budgets with alerts.

Associated Technologies and Tools

• EC2: virtual server instances, the foundational compute building block of AWS.
• S3: scalable, durable object storage, ideal for static files and backups.
• RDS: managed relational databases (PostgreSQL, MySQL, Aurora).
• CloudFront: global CDN for low-latency content distribution.
• Route 53: scalable, highly available DNS service.
• Lambda: serverless code execution, billed per millisecond of execution.

Conclusion

AWS is the most comprehensive and mature cloud platform on the market. Its range of services, global presence, and partner ecosystem make it a solid choice for businesses of all sizes. However, the very breadth of AWS can be intimidating, and misconfiguration can lead to unexpected costs or security vulnerabilities. At Kern-IT, we help our Belgian clients choose and implement the AWS services suited to their actual needs, with a pragmatic approach that prioritises simplicity and cost control. The goal is not to use as many services as possible, but to build a reliable, secure, and cost-effective infrastructure.