1099-K,
1099-NEC, and
1099-MISC are forms sent to you (and to the IRS) reporting income you earned as a freelancer.
1099-K forms are usually sent out from a payment-processing entity such as PayPal.
1099-NEC or
1099-MISC forms are sent out from people/companies who made payments to you. They're generally required to send you a
1099-NEC or
1099-MISC if they paid you at least $600.
Sometimes you may receive a combination of
1099-NEC,
1099-MISC, and
1099-K forms for the same income. Be careful and make sure you don't double report your income on your return.
Were you an Uber or Lyft driver?