When submitting a query in the search field, YouTube will give suggestions.The YouTube suggest keyword tool allows you to display all (sub)suggestions from the search within YouTube. If you fill in a search term such as “online advertising” or a part of this word, YouTube will automatically provide you keyword suggestions:
These suggestions are valuable: it displays terms that are relevant to the search query. YouTube determines which keywords are relevant (based on search volume, relevance, actuality, etc.). These keywords can be used to optimize content (e.g. content below videos) and to improve the alignment of search queries made by YouTube users. Fill in below the desired keyword and the YouTube suggest keyword tool will match it to all the sub suggestions (the tool will combine the chosen term with all the letters and numbers). Upon clicking on the suggestion, a new window will open where your search query will be carried out within YouTube .