Data Services allows administrators to very quickly and easily expose any table in the current database as a Service. Tables can be queried for information via a simple syntax.
If you came here looking for a mail-sending module, try HTML Mail (which can use this module for MIME-handling) or Mime Mail (which comes with its own MIME-handling library).
This module adds a text filter called "Conditional text" to your site. The conditional text filter allows you to write content for your site that contains sections that are displayed or hidden depending on certain conditions, allowing you to write content that can be used in different situations or for different audiences. For example, if you are writing software documentation, you might want to write content explaining how to use a particular feature, and include certain sections that apply to one version of the software, and other sections that apply to another version. If you were displaying this documentation to a user of one version, you would hide the inapplicable information from the other version. This allows you to avoid duplicating the content (which makes it more difficult to maintain) -- instead of writing a different manual for each version, you write one version with conditional sections.