中文：

纳斯达克（NASDAQ），全称为美国全国证券交易商协会自动报价表，是美国的一个电子证券交易机构，是由纳斯达克股票市场公司担任主人和营运商的场外交易市场。纳斯达克是全球规模最大的股票市场之一，成立于1971年，总部设在美国华盛顿特区。

纳斯达克的特点是以电脑电子交易为软硬件基础，建立了现代化的证券交易市场。其交易单位为“股”，以竞价交易方式为主，同时提供场外协议交易。此外，纳斯达克还具有清算、托管、登记、上市等功能，并设有多种交易指数，如纳斯达克综合指数、纳斯达克100指数等。

纳斯达克市场已经成为了全球新经济力量的代表，吸引了众多科技公司、初创企业等前来上市融资。同时，纳斯达克也是全球投资者关注的焦点之一，其上市公司中包括了众多全球知名企业。

总的来说，纳斯达克是一个高度现代化、高效、安全的股票市场，为全球投资者和企业提供了广阔的发展空间和机遇。

英文：

NASDAQ, officially known as the National Association of Securities Dealers Automated Quotations, is an electronic securities trading organization in the United States. It is an over-the-counter market operated by NASDAQ Stock Market Inc. as the principal and operator. NASDAQ is one of the largest stock markets in the world, established in 1971, with its headquarters located in Washington, D.C.

NASDAQ is characterized by using computerized electronic trading as its hardware and software foundation, establishing a modern securities trading market. Its trading unit is "share", mainly trading through auction, while providing over-the-counter trading through agreement. In addition, NASDAQ also has functions such as clearing, custody, registration, and listing, and operates multiple trading indexes such as the NASDAQ Composite Index and the NASDAQ 100 Index.

NASDAQ has become a representative of the new economic power in the world, attracting many technology companies, start-ups and other companies to list and raise funds. At the same time, NASDAQ is also one of the global investors' focuses, with its listed companies including many well-known global companies.

Overall, NASDAQ is a highly modern, efficient, and secure stock market that provides broad development space and opportunities for global investors and companies.