中文：

股票是股份公司为筹集资金而发行给股东作为持股凭证并借以取得股息和红利的一种有价证券。每股股票都代表股东对企业拥有一个基本单位的所有权。随着企业存续时间越长，股票越值钱。

股票可以根据其性质、面额、期限、发行地区等不同而分类。按性质分，有记名股票和无记名股票；按面额分，有壹元、贰元、拾元、百元、千元等股票；按期限分，有长期股票、中期股票、短期股票；按发行地区分，有A股、B股、H股、S股等。

投资者要进行股票投资，首先需要了解和掌握股票的基本知识和市场行情，并根据自身的投资目标、风险承受能力和资金实力等因素，选择适合自己的投资策略和交易方式。

英文：

Stocks are securities issued by joint-stock companies to raise funds, which are used as ownership certificates for shareholders to obtain dividends and profits. Each share represents the owner's ownership of one basic unit of the company. As the company survives for a longer time, the stock becomes more valuable.

Stocks can be classified into different categories according to their nature, face value, maturity, and issue area. In terms of nature, there are registered stocks and bearer stocks; in terms of face value, there are stocks with face values of 1 yuan, 2 yuan, 10 yuan, 100 yuan, and 1000 yuan; in terms of maturity, there are long-term stocks, medium-term stocks, and short-term stocks; in terms of issue area, there are A shares, B shares, H shares, S shares, etc.

For investors to invest in stocks, they first need to understand and grasp the basic knowledge and market conditions of stocks, and choose investment strategies and trading methods suitable for their own investment goals, risk tolerance and financial strength.