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1. No, you don't need to be in your workspace to run roslaunch, you can roslaunch from anywhere.
2. catkin is used to create and build packages and roslaunch starts up nodes, sets parameters, etc.
3. Yes.
4. A node is a program and a catkin package is a place that houses nodes and certain files.
5. See #2.

1. No, you don't need to be in your workspace to run roslaunch, you can roslaunch from anywhere.
2. catkin is used to create and build packages and roslaunch starts up nodes, sets parameters, etc.
3. Yes.As @gvdhoorn pointed out in the comments, catkin > is a wrapper around CMake that makes building entire ROS workspaces easier / feasible. Package management is expressly not part of its responsibilities.
4. A node is a program and a catkin package is a place that houses nodes and certain files.
5. See #2.

1. No, you don't need to be in your workspace to run roslaunch, you can roslaunch from anywhere.
2. catkin is used to create and build packages and roslaunch starts up nodes, sets parameters, etc.
3. As @gvdhoorn pointed out in the comments, catkin
>

is a wrapper around CMake that makes building entire ROS workspaces easier / feasible. Package management is expressly not part of its responsibilities.

1. A node is a program and a catkin package is a place that houses nodes and certain files.
2. See #2.

1. No, you don't need to be in your workspace to run roslaunch, you can roslaunch from anywhere.
2. catkin is used to create and build packages and roslaunch starts up nodes, sets parameters, etc.

3. As @gvdhoorn pointed out in the comments, catkin

is a wrapper around CMake that makes building entire ROS workspaces easier / feasible. Package management is expressly not part of its responsibilities.