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Now Lodash is just one library, a very popular one but absolutely not the only one,

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there are thousands of available Javascript utility libraries, for Javascript in the browser but also

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for Javascript on Node.js

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and as I said this concept exists not just for Javascript but for all programming languages you could

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say.

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In addition, the complexity of the library differs,

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it can be something like Lodash which offers a bunch of utility functions,

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it can be something else which allows you to write Javascript in a brand new way.

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There also are Javascript frameworks which are basically very large libraries, like Vue.js

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React or Angular, due to their complexity we'll have a look at those in a separate module though but we'll

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also cover this,

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these would be very big libraries. Typically when you say library, you mean something a bit smaller which

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focuses on one core task,

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in the case of Lodash it focuses on giving you a bunch of utility features and it is really good

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at that typically.

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Another popular Javascript library for example would be JQuery.

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It was very popular around 2010, 11, 12 and it still is heavily used but it was more important

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in the past because JQuery actually made working with the DOM, adding elements, querying elements

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way easier. Now since then, since the early days of JQuery, Javascript has come a long way and nowadays

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it's really easy to work with the DOM, traverse the DOM, work with CSS classes there and so on with

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native DOM APIs

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which is why you don't really need JQuery as often these days but you still might encounter it in a

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lot of tutorials and threads on the Internet you find and therefore you should be aware of it.

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It's a Javascript library which you add to your project basically as you added Lodash by downloading

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it or by using a CDN, as you see down there and then JQuery is not about giving you utility functions

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like getting the difference of two arrays but it gives you a lot of functions that help you work with

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the DOM and that can also be interesting

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but again as I said, basically all of that can nowadays also be done with the core Javascript APIs you

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learned about in this course.

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So you might not need that but you should be aware of it.