Taverna is a tool that simplifies the use and integration of web-based molecular biology tools and databases, especially web services. It allows bioinformaticians to construct workflows or pipelines of services to perform various analyses, such as sequence analysis and genome annotation. These workflows can integrate multiple resources into a single analysis. Taverna is available for free under the GNU Lesser General Public License (LGPL) from http://taverna.sourceforge.net/. The number of web-based tools and databases for DNA, RNA, and protein analysis is rapidly increasing, but communication between them is often a barrier to extracting new knowledge. Web services technology helps by providing standardized interfaces and descriptions (WSDL), enabling applications to exchange data using protocols like SOAP. However, web services have limitations, such as insufficient metadata, compatibility issues between services, and difficulties in debugging. Taverna, part of the myGrid project, is designed to make building and executing workflows accessible to bioinformaticians without expertise in web services or programming. It provides a single point of access to a range of services, primarily web services, with around 3000 publicly available services in molecular biology. Taverna allows users to quickly build workflows that integrate diverse resources, enabling rapid data exploration and hypothesis testing. Taverna supports a wide range of services from various organizations, including INSDC, EMBL-EBI, NCBI, and others. It can handle workflows that start with a GenBank identifier, retrieve DNA sequences, and use tools like RepeatMasker and GenScan for gene prediction. The workflow can be run using Taverna, which is available from the myGrid workflow repository. Taverna has been downloaded over 14,000 times and is used in various research areas across Europe, Asia, Australia, and the USA. The next version, Taverna 2.0, is being developed with features like support for high-throughput workflows, a semantically enabled registry, and enhanced results browsing. Taverna is supported by the UK e-Science programme and the Open Middleware Infrastructure Institute (OMII).Taverna is a tool that simplifies the use and integration of web-based molecular biology tools and databases, especially web services. It allows bioinformaticians to construct workflows or pipelines of services to perform various analyses, such as sequence analysis and genome annotation. These workflows can integrate multiple resources into a single analysis. Taverna is available for free under the GNU Lesser General Public License (LGPL) from http://taverna.sourceforge.net/. The number of web-based tools and databases for DNA, RNA, and protein analysis is rapidly increasing, but communication between them is often a barrier to extracting new knowledge. Web services technology helps by providing standardized interfaces and descriptions (WSDL), enabling applications to exchange data using protocols like SOAP. However, web services have limitations, such as insufficient metadata, compatibility issues between services, and difficulties in debugging. Taverna, part of the myGrid project, is designed to make building and executing workflows accessible to bioinformaticians without expertise in web services or programming. It provides a single point of access to a range of services, primarily web services, with around 3000 publicly available services in molecular biology. Taverna allows users to quickly build workflows that integrate diverse resources, enabling rapid data exploration and hypothesis testing. Taverna supports a wide range of services from various organizations, including INSDC, EMBL-EBI, NCBI, and others. It can handle workflows that start with a GenBank identifier, retrieve DNA sequences, and use tools like RepeatMasker and GenScan for gene prediction. The workflow can be run using Taverna, which is available from the myGrid workflow repository. Taverna has been downloaded over 14,000 times and is used in various research areas across Europe, Asia, Australia, and the USA. The next version, Taverna 2.0, is being developed with features like support for high-throughput workflows, a semantically enabled registry, and enhanced results browsing. Taverna is supported by the UK e-Science programme and the Open Middleware Infrastructure Institute (OMII).