如果一个网站没有部署SSL证书，可能会面临以下问题和风险：

1. 数据安全风险：没有SSL证书的网站数据传输不加密，用户和网站之间的通信（如登录信息、支付信息等）可能会被截获和窃取。
2. 浏览器警告：现代浏览器（如Chrome、Firefox等）会对没有SSL证书的网站显示警告信息，提示用户该网站不安全，这会降低用户的信任度。
3. 搜索引擎排名下降：搜索引擎（如谷歌）倾向于优先展示部署了SSL证书的网站，没有SSL证书的网站可能会在搜索结果中的排名较低。
4. 用户信任度降低：用户越来越重视网站的安全性，没有SSL证书的网站可能会让用户感到不安全，从而影响用户体验和转化率。
5. 合规性问题：某些行业和地区有法律要求网站必须部署SSL证书，如处理个人数据和在线支付的网站。没有SSL证书可能会导致法律风险。
6. 数据泄露风险：没有SSL证书的网站更容易受到中间人攻击（MITM），攻击者可以截获和篡改传输中的数据。
7. 品牌形象受损：没有SSL证书的网站可能会给用户留下不专业、不可靠的印象，影响品牌形象和声誉。
8. 技术限制：某些现代Web技术和API（如HTTP/2）要求网站必须部署SSL证书，没有SSL证书的网站可能无法使用这些技术。

域名SSL证书是一种用于在互联网上保护网站数据传输安全的数字证书。它主要通过加密技术来确保网站与用户之间的通信安全，防止数据在传输过程中被截获、篡改或泄露。以下是域名SSL证书的一些关键点：

1. 数据加密：SSL证书使用SSL（安全套接层）或TLS（传输层安全）协议对网站的数据传输进行加密，确保数据在客户端和服务器之间安全传输。
2. 身份验证：SSL证书可以验证网站的真实身份，防止钓鱼网站和中间人攻击。用户可以通过查看证书信息来确认网站的真实性。
3. 浏览器信任：主流浏览器（如Chrome、Firefox、Safari等）都内置了对SSL证书的信任机制。当网站部署了有效的SSL证书时，浏览器会显示一个锁形图标，表示该网站是安全的。
4. 搜索引擎优化：部署SSL证书的网站在搜索引擎排名中可能会获得优势，因为谷歌等搜索引擎会优先考虑安全性较高的网站。
5. 数据完整性：SSL证书通过数字签名确保数据在传输过程中的完整性，防止数据被篡改。
6. 适用场景：SSL证书广泛应用于电子商务网站、在线支付平台、企业内网、电子邮件服务等需要保护数据安全的场景。
7. 证书类型：根据验证级别和功能的不同，SSL证书可以分为DV（域名验证）、OV（组织验证）和EV（扩展验证）等类型。
8. 通配符证书：通配符SSL证书可以保护一个域名及其所有子域名，适用于拥有多个子域名的网站。

根据搜索结果，2024年通配符SSL证书的价格如下：

1. DigiCert品牌的DV（域名型）通配符SSL证书，优惠价格为1500元人民币一年。
2. Rapid SSL证书的DV（域名型）通配符SSL证书，优惠价格为1438.50元人民币一年。
3. 45 SSL证书的DV（域名型）通配符SSL证书，优惠价格为345元人民币一年。
4. GlobalSign SSL证书的DV（域名型）通配符SSL证书，优惠价格为3465元人民币一年。

这些价格提供了不同品牌和类型的通配符SSL证书的参考，您可以根据具体需求和预算选择合适的证书。

CA证书，全称为“证书颁发机构”（Certificate Authority），是一种由权威机构颁发的数字证书，用于确认实体身份和提供网络通信安全保证。CA证书的主要作用包括：

1. 身份验证：CA证书可以确认网络通信中双方的身份，确保数据交换的双方都是可信赖的实体。
2. 数据加密：CA证书包含用于加密和解密的公钥，通过公钥加密技术确保网络通信的安全性和真实性。
3. 防止篡改和窃听：CA证书通过数字签名确保数据在传输过程中的完整性和真实性，防止数据被篡改或窃取。
4. 确保数据传输的安全性：CA证书用于实现数据保密、身份验证和数据完整性，是互联网安全的基础。
5. 法律效力：在电子商务和电子政务等领域，CA证书具有法律效力，可以作为合同和交易的合法证明。
6. 多种应用场景：CA证书广泛应用于电子商务、网上银行、企业内网等需要身份验证和网络安全保障的场景中。

综上所述，CA证书是确保网络安全通信的重要工具，它在网络世界中扮演着“网络身份证”的角色，为我们提供了一个安全、可信的网络环境。

The key differences between a Certificate Authority (CA) and a regular SSL certificate provider are as follows:

1. Issuer of Certificates: A Certificate Authority (CA) is an entity that issues digital certificates, including SSL/TLS certificates, after validating the identity of the applicant. A regular SSL certificate provider, on the other hand, may refer to a service that provides SSL certificates, which could be either self-signed or issued by a CA. CAs are trusted third parties that authenticate the identity of the certificate holder, whereas a regular SSL provider might simply offer the technical means to obtain a certificate, which may or may not be trusted by browsers and users .
2. Trust and Recognition: CAs are recognized and trusted by browsers and operating systems globally. SSL certificates issued by these CAs are automatically trusted, and users see a padlock icon in their browser's address bar, indicating a secure connection. In contrast, a regular SSL certificate provider might offer certificates that are not automatically trusted, such as self-signed certificates, which would show a warning to users, affecting trust and security perceptions .
3. Validation Process: CAs undergo a rigorous process to verify the identity of the entity requesting the certificate, which includes organizational validation and, in some cases, extended validation. This process ensures that the certificate is issued to the rightful owner. Regular SSL certificate providers may not perform such extensive checks, especially if they are offering self-signed certificates .
4. Compliance and Standards: CAs must adhere to industry standards such as the CA/Browser Forum Baseline Requirements, which dictate how CAs operate and the level of assurance they provide. Regular SSL certificate providers may not be bound by these same standards, especially if they are not recognized CAs .
5. Certificate Types: CAs can issue various types of certificates, including SSL/TLS, code signing, and email certificates. A regular SSL certificate provider might focus solely on SSL/TLS certificates for securing websites .
6. Cost and Fees: Services provided by CAs often come with a cost, as they include identity verification and the assurance of a trusted certificate. Regular SSL certificate providers may offer free or lower-cost options, such as self-signed certificates, which do not provide the same level of trust and assurance .
7. Revocation and Management: CAs maintain a repository of all issued certificates and manage their revocation status. This is crucial for the security of the internet, as it allows for quick revocation in case a certificate is compromised. Regular SSL certificate providers may not have the same infrastructure or responsibility for managing the lifecycle of certificates post-issuance .