By discount curve $D(t)$ I mean the discount rate applied to a cash payment or receipt at time $t$.
What is the correct terminology to use? I have seen the term "yield curve" thrown around, but I'm not exactly sure what it typically means, given that there are different compounding conventions, definitions of yield, etc.
Is the same discount curve used for everything? In other words, are cash flows from government bonds, corporate bonds, swaps, etc. all discounted using the same discount curve? How is this discount curve typically constructed and where does OIS come into the picture?