Okay, imagine you and your friend want to play a game of tag. But before you start playing, there are some rules you need to agree on. You both need to decide who will be "it," where the boundaries of the game will be, and how long the game will go on for.
In the grown-up world, when a government or a company wants to get some work done, they also need to decide on some rules. They create a document called a "contract" that outlines all the important details of the work that needs to be done.
Now, when the government or company wants someone to do the work for them, they need to find the right person or business for the job. This is called a "bidding process." It's like putting out an ad for the job and asking people to apply.
Once all the applicants have submitted their proposals, the government or company has to choose the one they think is the best fit for the job. This is called an "award decision."
Just like when you and your friend agreed on the rules for your game of tag, the government or company looks at each applicant's proposal and decides which one follows all the rules outlined in the contract and will be the best for the job.
Once the winner is chosen, they are awarded the contract. This means they get to do the work and will be paid for it. Just like how you get a high-five from your friend when you finish playing tag without getting tagged.