What is the difference between weighted shares outstanding and share class shares outstanding?

Outstanding shares refers to stock that is currently held by investors. It also includes shares held by the general public and restricted shares that are owned by company officers and insiders. The number of outstanding shares changes if the company issues new shares, repurchases existing shares, or if employee options are converted into shares.
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Companies can issue shares in one or more shares classes, and the share classes may not be of equivalent value. For example, Berkshire Hathaway has two publicly traded share classes: BRK.A and BRK.B
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The weighted average shares outstanding, or the weighted average of outstanding shares, is a calculation that takes into consideration any changes in the number of outstanding shares over a specific reporting period.