Did you know that elements have had multiple versions made over the years, all with small but generally noticeable changes?
They are usually classified with the part number then a letter or words to distinguish the versions from each other.
For example, there are 6 versions of the classic 2x4 brick (see picture) and on Bricklink you can see the differences between them: https://www.bricklink.com/v2/catalog/catalogitem.page?P=3001#T=S&O={"iconly":0}
This is worth knowing as a builder to make sure you order the right version of a piece. Always check the title, which may include a or b to signify which version it is, such as 3001a or 3001b.
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