Process Attributes

Each process has the following attributes (and more)
Execution attributes
Current state (running, sleeping, ...)
Scheduling class and execution priority
Memory image

Filesystem attributes
A root directory and its current directory
Actually, nowadays we have "namespaces"
A controlling terminal (tty)
Access credentials (uid, gid, ...)

Environment variables

Permission attributes
User and group (uid, gid)
Limits (see command "ulimit")
Unique identifiers (PID and TID)
It belongs to a process-group and a session