Java is single threaded - can only run 1 command at a time., synchronous and asynchronous commands, avoid blocking your main thread, The scope of the var keyword is the global or function scop, In JavaScript, users can declare a variable using 3 keywords, hey can never be invoked with the new keyword, are only callable and not constructible, the event loop will pop the statement from the event queue and push it to the call stack., if all the statements from the call stack have finished execution,, Event loop is responsible for checking the call stack in the event queue,

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