While some slots have simple horizontal lines, others have complex patterns that cross the reels. Players who want to improve their gaming experience must be familiar with thesattaking-up. com fundamental terms used in online slots, such as paylines, reels, symbols, and volatility. The choice of theme. From traditional fruit machines to intricate story-driven adventures, online slots have a wide variety of themes. In order to improve engagement and enjoyment during gameplay, players should select a theme that speaks to their interests.