Networks

• a web crawler is a program that automatically visits web pages and collects information from them to put in an index
• Internet - global collection of inter-connected networks.
• the World Wide Web is a collection of interlinked web pages that can be accessed through the internet
• a DNS is used to translate a domain name into an IP address.
• a URL is a unique address for a web page or other resource on the internet and is a Uniform Resource Locator
• ACID stands for in transaction processing:

  Atomicity, Consistency, Isolation, Durability 
• EDI is a standardized format for electronic data exchange between businesses for data such as invoices, purchase orders, and shipping documents
• an ISP stands for internet service provider, they allow you access to the internet
• we use IPV6 rather than IPV4 because it has more combinations and more people can use it as there is only 6 billion combinations and there are more people in the world
• LANs - a group of peripherals and devices connected in a small geographical area 
• WAN -  a group of LAN's connected in a large geographical area
• the advantages and of bus topology is that it is easy to add devices and it is cheap, the disadvantages are that it is connected by wires and can have data collisions in a small network
• a API is used for integrating and communication between different software systems