Which asset has the highest liquidity?

Could you please elaborate on which asset, among the various options available in the cryptocurrency and finance landscape, possesses the highest level of liquidity? I'm particularly interested in understanding which one allows for the seamless and efficient exchange of assets into cash or other assets, with minimal impact on its market price. Additionally, I'd appreciate insights into the factors that contribute to this asset's high liquidity, such as its trading volume, market capitalization, and the ease of access for investors.