A fractional share is a part of a whole share. This allows investors to access equity investing in small amounts, especially if a particular stock may be trading at high absolute levels like for example at $1,000 per share. Owning fractional shares entitles a shareholder to the same rights as a regular shareholder like for example dividends.
Moneybase offers fractional share trading on most US stocks.
More information about fractional shares, fractional share trading and how do invest in fractional shares with Moneybase can be found here: https://moneybase.com/blog/educational/fractional-shares-how-to-get-a-piece-of-your-favourite-stocks-at-a-price-you-can-afford/