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"A web application or web app is any application software that runs in a web browser or is created in a browser-supported programming language (such as the combination of JavaScript, HTML and CSS) and relies on a common web browser to render the application. ... Applications are usually broken into logical chunks called "tiers", where every tier is assigned a role. ...
For more complex applications, a 3-tier solution may fall short, and it may be beneficial to use an n-tiered approach, where the greatest benefit is breaking the business logic, which resides on the application tier, into a more fine-grained model. Another benefit may be adding an integration tier that separates the data tier from the rest of tiers by providing an easy-to-use interface to access the data. For example, the client data would be accessed by calling a "list_ clients()" function instead of making an SQL query directly against the client table on the database. This allows the underlying database to be replaced without making any change to the other tiers." [Web application. Wikipedia]
The AWS architecture diagram example "3-Tier Auto-scalable Web Application Architecture" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the AWS Architecture Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.
AWS architecture diagram
AWS architecture diagram, region, instance, hosted zone, email notification, elastic load balancer, bucket, availability zone, auto scaling group, RDS DB instance standby, Multi-AZ, RDS DB instance, Instance with CloudWatch, ElastiCache, DynamoDB, Cloudfront, Amazon SES,
Used Solutions

Network Diagramming with ConceptDraw PRO

Communication network diagram example
At the moment computer networks are widespread, various types of computer networks are constructed around the world, operate and interact with each other. There are many kinds of computer networks that differ in the transmission medium, in communications protocols, in size, topology, organizational intent, and also in territorial basis. There are popular such types of computer networks as Global Area Network (GAN), Wide Area Network (WAN), Metropolitan Area Network (MAN), Local Area Network (LAN). ConceptDraw PRO is a powerful network diagramming software, perfect for software engineers, software designers and software developers who need to draw Computer Network diagrams, designs, schematics, and network maps in no time. The pre-drawn shapes representing computers, network devices and smart connectors offered by ConceptDraw solutions help to create the accurate diagrams and documentation, represent computer network topologies and designs, depict Computer network architectures, logical, physical, cable networks, and vehicular networks.

network topology diagram software, network icons, network diagram template, networking icons available, how to draw a network diagram Computer Network Diagrams

network topology diagram software, network icons, network diagram template, networking icons available, how to draw a network diagram
Computer Network Diagrams solution extends ConceptDraw PRO software with samples, templates and libraries of vector icons and objects of computer network devices and network components to help you create professional-looking Computer Network Diagrams, to plan simple home networks and complex computer network configurations for large buildings, to represent their schemes in a comprehensible graphical view, to document computer networks configurations, to depict the interactions between network's components, the used protocols and topologies, to represent physical and logical network structures, to compare visually different topologies and to depict their combinations, to represent in details the network structure with help of schemes, to study and analyze the network configurations, to communicate effectively to engineers, stakeholders and end-users, to track network working and troubleshoot, if necessary.

microsoft azure, windows azure, azure management, azure storage, azure blob storage, azure services Azure Architecture

microsoft azure, windows azure, azure management, azure storage, azure blob storage, azure services
Azure Architecture solution bundles into one handy tool everything you need to create effective Azure Architecture diagrams. It adds the extra value to versatile ConceptDraw PRO software and extends the users capabilities with comprehensive collection of Microsoft Azure themed graphics, logos, preset templates, wide array of predesigned vector symbols that covers the subjects such as Azure management, Azure storage, and Azure services, amongst others, and allow you to illustrate Azure Architecture diagrams at any degree of complexity, to present visually your Azure cloud system architecture with professional style, to design Azure cloud topology, to document Windows Azure Architecture and Azure Cloud System Architecture, to visualize the great abilities and work of Microsoft Azure Cloud System and Azure services.