Hyatt Hotels Corporation, a Delaware corporation, and its consolidated subsidiaries (collectively "Hyatt Hotels Corporation") provides hospitality and other services on a worldwide basis through the operation, management, franchising, ownership, development, and licensing of hospitality businesses. We operate, manage, franchise, own, lease, develop, license, or provide services to a portfolio of properties. At September 30, 2021, (i) we operated or franchised 505 full service hotels, comprising 169,567 rooms throughout the world, (ii) we operated or franchised 523 select service hotels, comprising 75,312 rooms, of which 438 hotels are located in the United States, and (iii) our portfolio included 9 franchised all-inclusive Hyatt-branded resorts, comprising 3,591 rooms. At September 30, 2021, our portfolio of properties operated in 69 countries around the world. Additionally, through strategic relationships, we provide certain reservation and/or loyalty program services to hotels that are unaffiliated with our hotel portfolio and operate under other tradenames or marks owned by such hotels or licensed by third parties.
As used in these Notes and throughout this Quarterly Report on Form 10-Q, (i) the terms "Hyatt," "Company," "we," "us," or "our" mean Hyatt Hotels Corporation and its consolidated subsidiaries, (ii) the term "hotel portfolio" refers to our full service hotels, including our wellness resorts, and our select service hotels, (iii) the terms "properties," "portfolio of properties," or "property portfolio" refer to our hotel portfolio; all-inclusive resorts; and residential, vacation, and condominium ownership units that we operate, manage, franchise, own, lease, develop, license, or to which we provide services or license our trademarks, including under the Park Hyatt, Miraval, Grand Hyatt, Alila, Andaz, The Unbound Collection by Hyatt, Destination by Hyatt, Hyatt Regency, Hyatt, Hyatt Ziva, Hyatt Zilara, Thompson Hotels, Hyatt Centric, Caption by Hyatt, JdV by Hyatt, Hyatt House, Hyatt Place, UrCove, and Hyatt Residences Club brands, and (iv) the term "hospitality ventures" refers to entities in the hospitality industry in which we own less than a 100% equity interest.
The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information, the instructions to Form 10-Q, and Article 10 of Regulation S-X. Accordingly, they do not include all information or footnotes required by GAAP for complete annual financial statements. As a result, this Quarterly Report on Form 10-Q should be read in conjunction with the Consolidated Financial Statements and accompanying Notes in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the "2020 Form 10-K").
We have eliminated all intercompany accounts and transactions in our condensed consolidated financial statements. We consolidate entities under our control, including entities where we are deemed to be the primary beneficiary.
Management believes the accompanying condensed consolidated financial statements reflect all adjustments, which are all of a normal recurring nature, considered necessary for a fair presentation of the interim periods.
Impact of the COVID-19 Pandemic
The COVID-19 pandemic and related travel restrictions and containment efforts have had a significant impact on the travel industry and, as a result, on our business. The impact began in the first quarter of 2020 and has continued in 2021. As a result, our financial results for the current interim period, and for the foreseeable future, are not comparable to past performance or indicative of long-term future performance.
The extent, duration, and magnitude of the COVID-19 pandemic's effects will depend on various factors, all of which are highly uncertain and difficult to predict, including, but not limited to, the impact of the pandemic on global and regional economies, travel, and economic activity; actions taken by governments, businesses, and individuals in response to the pandemic, any additional resurgence, or COVID-19 variants; and the distribution, efficacy, and broad acceptance of COVID-19 vaccines.
We are required to make estimates and assumptions that affect the amounts reported in our condensed consolidated financial statements and accompanying Notes. Our estimates and assumptions are subject to inherent risk and uncertainty due to the ongoing impact of the COVID-19 pandemic, and actual results could differ materially from our estimated amounts.