Infrastructure as Code (IaC) is the managing and provisioning of infrastructure through code instead of through a manual process.
AWS provides native support for IaC through the CloudFormation service.
REST-styled APIs are all around us. Many applications need to invoke REST APIs for some or all of their functions. Hence for applications to function gracefully, they need to consume APIs elegantly and consistently.
A hash is a piece of text computed with a cryptographic hashing function. It is used for various purposes mainly in the security realm like securely storing sensitive information and safeguarding data integrity.