-SimGrid is a simulator of distributed computer systems. It can be used
-to either assess abstract algorithms, or to profile and debug real
-distributed applications. SimGrid enables studies in the domains of
-(data-)Grids, Clusters, IaaS Clouds, High Performance Computing,
-Volunteer Computing and Peer-to-Peer.
-
-SimGrid is a feature rich framework, with many options and
-possibilities. Hopefully its documentation will help you getting at
-full gear. But nothing's perfect, and this documentation is really no
-exception here. Please help us improving it by reporting the issues
-that you see.
+SimGrid is a framework to simulate distributed computer systems.
+
+It can be used to either assess abstract algorithms, or to profile and
+debug real distributed applications. SimGrid enables studies in the
+domains of (data-)Grids, Clusters, IaaS Clouds, High Performance
+Computing, Volunteer Computing and Peer-to-Peer.
+
+Technically speaking, SimGrid is a library. It is not a graphical
+interface nor a command-line simulator running user scripts. You
+interact with SimGrid by writting programs with the exposed functions
+to build your own simulator.
+
+SimGrid have many features, many options and many possibilities. The
+documentation aims at smoothing the learning curve. But nothing's
+perfect, and this documentation is really no exception here. Please
+help us improving it by reporting the issues that you see and
+proposing the content that is still missing.