Difference between array, arraylist, List, Hashtable, Dictionary and SortedList in c#

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Basic difference is that arrays are of fixed size. Whereas an ArrayList implements the list data structure and can dynamically grow. While arrays would be more performance that a list, a list would be far more flexible since you don't need to know the required size initially. Array - represents an old-school memory array - kind of like a alias for a normal type[] array. Can enumerate. Can't grow automatically. I would assume very fast insertion, retrieve and speed. ArrayList - automatically growing array. Adds more overhead. Can enum., probably slower than a normal array but still pretty fast. These are used a lot in .NET List - one of my favorites - can be used with generics, so you can have a strongly typed array, e.g. List . Other than that, acts very much like ArrayList. Hashtable - plain old hashtable. O(1) to O(n) worst case. Can enumerate the value and keys properties, and do key/val pairs. Dictionary - same as above only strongly typed via generics, such a...
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What are meta descriptions and do they still matter?

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A meta description is the text that appears below your page in a search engine result that explains what the page is all about. In this example, the meta description is "Learn the elements needed to write a comprehensive blog post in just 9 easy steps
Meta descriptions still matter, just not in the same way they used to. They used to be a place to optimize for keywords so crawlers would know more about your page contents; now, it's more important you write something compelling that makes readers want to click so you can improve conversion rates from SERP results to your website.

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