The best currency to use in Kazakhstan is the Kazakhstani Tenge (KZT) for most transactions, ensuring favorable exchange rates and acceptance, especially in local markets and small shops. US Dollars (USD) are widely accepted in larger cities and tourist areas, convenient for hotels and tourist-oriented establishments. Euros (EUR) are also accepted in some tourist spots, but less commonly. It's recommended to primarily use Tenge, exchanging currency upon arrival, and carry a small amount of USD or Euros for backup. This mix offers flexibility while ensuring you're prepared for various transactions during your visit to Kazakhstan.