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GPL, or General Public License, is a type of open source license that is commonly used for WordPress plugins. WordPress itself is licensed under the GPL, and as a result, all plugins and themes that are distributed for use with WordPress must also be licensed under the GPL or a compatible license.

The GPL license grants users the right to use, modify, and redistribute the software, as long as the license remains intact and the source code is made available to anyone who wants it. This means that users are free to make changes to the plugin and distribute it, as long as they follow the terms of the GPL license.

GPL plugins are popular among WordPress users because they offer a high degree of flexibility and freedom. However, it’s important to note that plugins licensed under the GPL are not necessarily free to use. Some plugin developers offer both a free version and a premium version of their plugin, with the premium version offering additional features and support.

Overall, the GPL license is an important aspect of the WordPress ecosystem, and it helps to ensure that users have the freedom to customize and extend their WordPress websites as needed.

A theme and a plugin are both types of add-ons for the content management system (CMS) software WordPress.

A WordPress theme is a collection of templates and stylesheets that define the look and feel of a website. Themes control the design and layout of a WordPress website, including the header, footer, sidebar, and font styles. Themes can be custom-built or purchased from a marketplace.

A plugin is a software add-on for WordPress that adds additional functionality to a website. Plugins can add new features, enhance existing functionality, or integrate with third-party services. Examples of plugins include contact forms, social media sharing buttons, and e-commerce solutions.

In short, a theme defines the appearance of a website, while a plugin adds functionality to the website.

Yes, GPL plugins are legal. The GPL (General Public License) is a widely used open-source license that allows software to be freely distributed and modified. WordPress and many of the plugins and themes available for it are licensed under the GPL, which means that they are subject to the terms and conditions of the license.

The GPL license is designed to promote the sharing and collaboration of software, and it allows users to use, modify, and redistribute the software as long as they follow the terms of the license. This includes making the source code available to others and releasing any modifications made to the code under the same license.

In summary, the GPL license is a legal and widely accepted open-source license that allows for the distribution and modification of WordPress plugins and themes. As long as the terms of the GPL license are followed, the use of GPL plugins is completely legal.