The standard delivery of the 1C-Bitrix software product includes a license for an unlimited number of sites (except for the licenses "First Site" - 1 site and "Start"- 2 sites). You can create, for example, a Russian-language and English-language resource, or a corporate website and an online store according to the functionality of your chosen edition.
All sites operating under the same license must be hosted on the same hosting and use one copy of the software product. The technology of developing 2 or more sites on the same license is called "Multisite". You can read more here.
The limit on the number of sites is removed only when installing the version "1C-Bitrix: Site Management" 18.0 and higher. The license must not only be renewed, but also updates must be installed.
In addition, starting from version 18.0, the functionality of Site24 is available - a built-in website builder that allows you to create web pages without programming. It is ideal for creating an unlimited number of pages, landing pages and full-fledged websites and interacting with your online store.
The functionality is included in all licenses (except the "First Site" license). It is possible to use the "Site24" constructor only on an active license.