It seems you're referencing a large liquidation of an Ethereum $ETH long position.
A "liquidated long" occurs when the value of a leveraged position falls to a level where the trader's margin is no longer sufficient to cover the losses resulting in the position being automatically closed.
In this case:
The long position was valued at $99.7K.
The liquidation price was $2,887.78.
This means that the price of $ETH fell to this level triggering the liquidation of the position.
If the trader was betting on the price of ETH to rise and it instead dropped to or below this price the exchange would have automatically sold the position to prevent further losses.
