You may have overheard the term alpha reader and might not be entirely sure of what it means. What they undertake, or what is their purpose? But firstly, what is an alpha reader?
The alpha reader or often called the first reader reads the author’s work-in-process prior to finishing it. This could occur as soon as the author completes the first draft or could be a little later. Then, perhaps, the author reads the first manuscript, makes any necessary corrections, and then shows the second manuscript to the alpha reader.
If an author utilizes an alpha reader, they will want them to review their manuscript before sending it to an editor (if the author has the plans of having one).