Scalability refers to the ability of a system or network to handle an increasing amount of work or users without sacrificing performance. It's like adding more lanes to a highway to accommodate more traffic.
Metadata is data that provides information about other data. It describes various attributes such as file size, creation date, author name, etc. It's similar to the description on the back cover of a book that gives you an overview of its content.
Cloud Computing: Cloud computing is the delivery of computing services over the internet. Instead of storing and accessing data locally on physical devices, cloud computing allows users to access resources and applications remotely through servers in data centers.