In graphic design, placeholders are very useful as it allows you to design a template, then substitute in the appropriate material, such as photos, when the design is finished.
This is particulary useful when designing the overall layout, as you can play with the spacing between items, how big the image should be, et cetera.
The same is true for text, but it is not as simple as you would imagine.
You could paste in a block of text that is an excerpt from somewhere, but this comes with the issue that it is distracting. This is because we are hardwired to start reading a line of text to understand it. Therefore, the designer is distracted from seeing the overall layout as they see the trees instead of the forest.
You could type gibberish text, but this does not look aesthetically pleasing at all.,
An elegant solution is the Lorem Ipsum text. Lorem Ipsum has been used in the printing industry since the 1500s. Ever since, it has been the gold standard in printing and design, both analogue and digital.
As an English speaker, Lorem Ipsum almost looks like normal text, but on closer inspection, you soon realise that you have no idea what it says. However, it is not complete nonsense – it is in fact a collage of text taken from a piece of classical Latin literature called “de Finibus Bonorum et Malorum” (The Extremes of Good and Evil) by Cicero, written in 45 BC.
The standard Lorem Ipsum passage that the industry still uses to this day is largely unchanged since the 1500s. It goes as follows:
“Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.”