Youtube is an important resource because there are many videos, films, series, songs, sketchs... In English, spanish, sometimes the video has subtitles...
This is important for teachers and kids, because educators can watch and then they can show this in their classes.
For the meaningful learning is the best because the videos are contextualized in a concrete situation (at home, at cinema....) For example, I put a chapter (the simpsons) in english, the video usually is contextualized in the town, Sprinfield.
In my opinion, youtube is a tool for education that teachers must use in the class.
For example:
https://www.youtube.com/watch?v=-glAfVpEvV8
This is a good video for learning the alphabet in foreign languages, english, the material relate the animals with the letters; A with alligator...
https://www.youtube.com/watch?v=OwRmivbNgQk
This is a video for learning the animal that live in a zoo, it is a good material, the title is: let´s go to the zoo , and the teacher can use for a social tas. You can show this resource in your class for explain a visit to the zoo. This is only an example, you can use this resource that you like.
Other example that you can use the verbs with animal´s actions.
https://www.youtube.com/watch?v=HwSKkKrUzUk
Circle of live is a little part of The Lion King that you can use for explain the food chain, life assocition in animals, the african savannah, geography: mountains, rivers....
https://www.youtube.com/watch?v=frN3nvhIHUk
This video says questions and answers about the food, ice cream, brocoli... It is good for your class because the children must watch some videos, listen songs, conversations, dialoges...
https://www.youtube.com/watch?v=NAEb1ZxukJM
This video is a chant, because there are some words repeat, it is practical for your class, the children listen, repeat (this is the base for the learning), reflect, understand... The topic is amazing, the shopping, kids like this topic, he loves the money, products, places.
https://www.youtube.com/watch?v=t5yvIKMCIPs
Old mcdonalds´farm is a clasic song. The children love this song, because already kids don´t know the farm, animals... There are many children that they live in a big city.
After the class, children can watch videos at home, for be able to better in their pronuntation, pet it attention to the animal and their noises....