What is the container?

(1) In HTML, the container is the area enclosed by the beginning and ending tags. For example < HTML > encloses an entire document while other tags may enclose a single word, paragraph, or other elements. In HTML code, all container must have a start and stop tag to close the container. Without a stop tag, the start tag will apply to the entire document.
(2) In software development terminology, the word container is used to describe any component that can contain other components inside itself. Examples of containers include Java applets, frames, and windows.
(3) In video terminology, a container is often used to specifically describe a container format.
 
Web container (also known as a Servlet container) is the component of a web server that interacts with Java servlets. A web container is responsible for managing the lifecycle of servlets, mapping a URL to a particular servlet and ensuring that the URL requester has the correct access rights.

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Web container is the part of a web server that communicates with Java servlets. A web package is responsible for handling the lifecycle of servlets, applying a URL to a particular servlet and ensuring that the URL requester has the correct access rights.
 
Holder, with regards to Java improvement, alludes to a part of the server that is in charge of dealing with the lifecycle of Web applications.
 
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